Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e14f6bb7cc39cf…

MALICIOUS

PDF

80.8 KB Created: 2021-07-05 05:29:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 99b10bf1bfd88c26dca16cb962d16bab SHA-1: ff17af0be96891b2bed8a5f90f611981b7717b86 SHA-256: 82e14f6bb7cc39cf1273b6fad5b6eeb9e31cb6d60b33f91809aeb680d26dd2e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially compromised WordPress sites and disposable hosting. The document body is unreadable, but the presence of multiple links suggests an attempt to direct users to external, malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • 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://jadever.vn/Images_upload/files/gupezupidojivarepazaxow.pdf In PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160731cb3274d1---serusitopigijotapugasi.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/fefazatedizunifazuzod.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/nujina.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/pimilerizo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d59aa018ff---xoketezowobad.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/2531707545.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/rikubotinozuserupepotuz.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/80351246397.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/86176572303.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/44176110309.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/redadevobevatikapefatosu.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/bepuf.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6fec0ca2a7069b952f5217471987e27b/kukalomixu.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608097f40078d---44248634111.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ecfc4cfef---39468467067.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/26147227881.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/sipokapajek.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a3a76d8a6d---63987665742.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/ql277ll24005s7pjocfq4mt52e/85635793485.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fba2840c4a---65414779039.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/22059884389.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f999af6b0---xafef.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9706295499.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=outlook+pst+to+mboxPDF 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_off0000db20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB20 16860 bytes
SHA-256: d9b46e056b3dacef42fccd6d80d43b67546fa5d7358e5c645d351cc59a857972
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F51 10280 bytes
SHA-256: 907810e3c80e33cbe7256ef7eceeef16f06e60e7fad00aff5a7d81ad43034a57

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