Malicious PDF — malware analysis report

Static analysis result for SHA-256 bade4a94e76e75b6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 14:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9f1f8443a6b6b1610548b032d8e2409 SHA-1: bde56ee7e0156623dd34f34fc472fb7649b5cc20 SHA-256: bade4a94e76e75b67f00382fced699480212516dcf9687f8291e75e6e9802fc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://wastran.ru/uplcv?utm_term=what+is+an+android+dialer
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b5d21ade1---davodowi.pdf
    • http://giasuthanhdat.vn/Images_upload/files/82865281724.pdf
    • http://thebookmarkcafe.com/uploads/files/dupodasobegunolib.pdf
    • http://oppedisanorobertosrl.com/userfiles/files/83535103986.pdf
    • http://noithatnhapkhaugiasi.com/luutru/files/xasutadapatazozep.pdf
    • https://ovistar-dz.com/ckfinder/userfiles/files/68396576630.pdf
    • http://besttailor.info/ckfinder/userfiles/files/71567661531.pdf
    • https://leciv.fr/uploads/FCK_files/file/85011279887.pdf
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dolulasazuniwavij.pdf
    • https://www.funes.gob.ar/ckfinder/userfiles/files/fegome.pdf
    • http://waypl.pl/upload/File/putuzegepi.pdf
    • https://fertilizergranulatorprice.com/d/files/jisikupijefexibojifafixe.pdf
    • http://www.dkmodels.net/ckfinder/userfiles/files/sudupajumigonav.pdf
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/45314433877.pdf
    • http://willowslakerhea.org/userimages/86970666543.pdf
    • https://hijaustabilo.com/contents/files/9054366112.pdf
    • http://churchontherockuk.org/home/churchontherock1/public_html/userfiles/files/17450797224.pdf
    • http://fortwashington.abwingsmd.com/uploads/files/xebemalarobibe.pdf
    • http://dezmaster.com/userfiles/file/41657478812.pdf
    • https://gogift-it.com/userfiles/files/7810467877.pdf
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/11881581953.pdf
    • http://www.rupankar.com/fckimages/file/livigexudenazifogaloki.pdf
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161360324ee993---26361755881.pdf
    • http://domuran.pl/files/file/loribonerisowawarujeduj.pdf
    • https://lbjgold.in/ckfinder/userfiles/files/jofolutuxojame.pdf
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/99ba459ff7ba76c2711880fc0e7292f1/zuzezowo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d86b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD86B 16792 bytes
font_01_sfnt_off0000f082.bin
f266d026688d8c335b1eded642044fd3b3376d0adddbf18e2abc4b7274bbd373
pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10340 bytes
font_02_sfnt_off000107c7.bin
cbebd8eb2a0f884128eb51a5e9159506b8781dadea28689aec6a5db40bba4e74
pdf-font-stream PDF embedded font (sfnt) at offset 0x107C7 16676 bytes