Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1b7381a3466057…

MALICIOUS

PDF

101.4 KB Created: 2021-07-19 04:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4984aefbf7a341bbf93241fce5189a63 SHA-1: 9962d0400b663466d85bed9577d3b0f7e7fc591b SHA-256: 4b1b7381a3466057b210280c8e90f3424ba33d339947df8cf0a2c5ffaa199e63
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://rolmech-strzelno.pl/Upload/file/vetirorobezedikosepa.pdf In PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4r8eq9d7osl5h794b5fiq2tpn5/39106207919.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/60539483140.pdfIn PDF document text
    • http://com123.vn/uploads/file/94140167511.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/7aadeb22466d29d87b95c7bd7efa84d2/saxomaresubepuniwogediri.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/kofobowabokopixaku.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160deef285d1f6---14149207767.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/kigubebexurewutulatek.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/mobedisokevur.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/motufufogi.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/72541547327.pdfIn PDF document text
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/4989ccfb3a2342d79fbf66f8f715244c/zopetogajakobofivasobufo.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/bugiwufalinotiwitesofum.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3941853271---87894842477.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210616_4C058AD12D1C43B9.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/44f17ef625a8ce2aed80050e48c1400f/fasilabal.pdfIn PDF document text
    • http://kokomo1986.com/clients/31029/File/miwiwe.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/6436416909.pdfIn PDF document text
    • https://etimes.mn/uploads/files/78079288802.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/fe2da3113e426ab992182718a5e83939/wutomifuxi.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/65993407927.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1e95ae4e0---xomubafenuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=techniques+of+a+good+listenerPDF 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_off0001281a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281A 10964 bytes
SHA-256: 64cee75ec2f0d4863236680d85ca654a1fb645d621634f6182f668e4b8514280
font_01_sfnt_off000140f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F9 17732 bytes
SHA-256: a3ed2157539d842f54f38ef186f6f8fea1c4c5fefac2d926a53fd26ca32986df
font_02_sfnt_off00016ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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