Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d1368c50e5ca0d1…

MALICIOUS

PDF

87.0 KB Created: 2021-06-27 19:10:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0ad31774ed3afa9f9e9bd18c9f3f4e5f SHA-1: 102b43b30fc6501ed5aa0b0915148afa4696e8cf SHA-256: 6d1368c50e5ca0d1fc0837beaaa6b5e16e0d48c20698d451949814d63f8a7cf9
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits multiple indicators of malicious intent, including a high ML classifier score and ClamAV detection as a phishing trojan. The presence of a 'download button' lure and explicit instructions for handling a password-protected archive strongly suggest a social engineering tactic to trick users into downloading a hidden payload. The document also contains numerous links to potentially compromised or disposable hosting sites, indicating a distribution mechanism for malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://geose.ru/userfiles/file/16723680330.pdf In PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/jrq86c550av5ruul1ivv79rn3j/24459264689.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/98628235747.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/757de02b4a02c9dfdf4eb9580b4288f2/37135341553.pdfIn PDF document text
    • http://garderoba.sk/images/_file/binesobavamafize.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/6ed2f3e363692beed59da7cca956d14f/tipifevufuvonajof.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90a0c08fc2---gafabebebakabitesalakukod.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e96958f528---89356099832.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160cb613c5d101---muwugimobesin.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1a3ee3856---92194228010.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/45407436834.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc800460fb---98657636984.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/zokufolelixubabudo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ed724dc19---lowanezurowafavaza.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/8m7akg6hn789mih4l3qena0gp3/1254757861.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160812bf620556---rufeduluporizodonuwu.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b93eedc41f---wopaded.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/ad7f73b62227f29aae7279ea32d5a1f4/zolowo.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/dogexofimalawewuwesolured.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/of0suagre8t09li95ko3ccpid4/82848001538.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7c36e0ef7---mexigi.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609280b635ba9---65291970834.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/3272789770.pdfIn PDF document text
    • http://mosjob.ru/images/file/jegipibowiz.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160878e9ac813f---mejisepuwefin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+save+password+protected+file+without+passwordPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 10856 bytes
SHA-256: d824202bad0d48bf2cca71db1b71d4aac4d0e6ee3f9542a23f6c7d1c14e5514d
font_02_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 16828 bytes
SHA-256: 51215d3d99578490f09e9886434c18664ab48843f35d13e49755cfe1d246161e

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