Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2a427af9dc7e658…

MALICIOUS

PDF

90.5 KB Created: 2021-08-02 14:41:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29961a02a478d1b3255d7348de1902ca SHA-1: c3572dc2bcee204b6cef2562b0b160ba9a7f1a6b SHA-256: d2a427af9dc7e658019f10406eb496dcaa1c927fe7a0b0f72d59e789fda28a6e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to compromised websites, suggesting a link farm designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the presence of embedded URLs and the overall structure point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.cenlajobinator.com/siteuploads/editorimg/file/2875762225.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3e19edd217b1639dbcaca90ff54e33b8/bepisumolu.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b95d11d498---pojibe.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071372fcc6a4---romatedoxuxurezodek.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210604185343_258773791.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/71099889400.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/xopuvamavadubuxebilakaku.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/4014323270.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e46253bcbb8a608dc7e4bfb0db10347c/26045046290.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/73653426659.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a12655015---butaposinuzuselateko.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/lozuwawasesinidujorer.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16082eb69c885f---mugoxikafufozulagobugef.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/fupefuxodebusopavo.pdfIn PDF document text
    • http://azizolace.cz/images/file/feropaxagekujoxuvosejuwim.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/namogebagerizumidat.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/16597310907.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162619604070182538950.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/2301552314.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/gudikine.pdfIn PDF document text
    • https://acavacecio.it/userfiles/files/46772346451.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/17985554293.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b0a6aae3---91263078366.pdfIn PDF document text
    • https://t2sc.me/userfiles/nokezomulirofazujabu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=tamil+new+movies+download+isaimini+tamilrockers+2019PDF 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_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 17232 bytes
SHA-256: e77fbdba3fc9dc6e9cf9c4d2e9891a3d88ab8dd696cc7457090ff3527acdb4b3
font_01_sfnt_off00012972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14189 11200 bytes
SHA-256: 0f81706cb2b997ebf8beb3d7cbd04da4704538dfaf0eb648d2ae63a188d02686