Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f6b803a8f7a125…

MALICIOUS

PDF

89.0 KB Created: 2021-07-28 02:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e4d65996cb7309ca398b29d12eb213aa SHA-1: 3cb14b3bd76171ab5c481d00e889b274ba761854 SHA-256: 89f6b803a8f7a1251f9187b39bb46aed54a029bfe23fd54335e9b1038164be82
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/6ca94f59bdf0b459b2610c939bfeb409/40854640447.pdf In PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/loniposepusimuser.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a586497f972---30023353818.pdfIn PDF document text
    • https://btegypt.com/file/xulud.pdfIn PDF document text
    • http://newmob.it/userfiles/files/zeludivi.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/89440276718.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f5fc2313c---20579231270.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078f3a46c12a---55119320681.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f052fb4b25d---2267300198.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/0acea14e484dad842841528079ee7439/xuromepiwizodo.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2052b0a1d---posokederubozijef.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/bizusifamotug.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/84864266652.pdfIn PDF document text
    • http://nextgenship.net/upload/file/20210518162136568533.pdfIn PDF document text
    • http://abpaluso.com/upload/file/50714458018.pdfIn PDF document text
    • https://mygo.com/ckfinder/userfiles/files/kelusikomasom.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/ff1a96a87b96c4964287fad2343c1a2d/ridozilopobigufadexe.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7b1b9e9c4a46272c2a1f0bb545b99c51/koxozux.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/v7653tub8nao8tstepbvqose7l/23595334866.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b63c4da0276ca900bed32ce9ff57ca22/89166728384.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/iajlgnd7hdtkt7mj9eoh4me9gi/zumen.pdfIn PDF document text
    • http://ruilong-ironwork.com/CKEdit/upload/files/59124380945.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=soccer+star+2019+mod+apk+android+plus+1PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 22288 bytes
SHA-256: c01a56e7a6ac981589226ce5eaf9a9d799a107c44c7e65b9b4b8e08a314f3b31
font_01_sfnt_off00012376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8D 11404 bytes
SHA-256: 69ad94cb617db400fb6c30a385950cfa90023a0c8b84706010b40375a21d720f

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