Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7e490e77df90b06…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 12:24:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 22d40ccda6801301635b8a58a9efcffc SHA-1: 1b9596657073fb8d8e271c61a4a2a087168666d7 SHA-256: c7e490e77df90b06171f47b9ffd92bcaf6df91f28d924597eae3cccbffc7903f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites, suggesting a phishing or malware distribution scheme. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/8143e311e7cd7f2406898925db942cdc/podivafaxasirulas.pdf In PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b48a0f6e3---zotujag.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/sopalugasuzovokemorema.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/68838006213.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/falefutugibafajadedokon.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/koxar.pdfIn PDF document text
    • http://dentistturkey.com/image/files/53783244787.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/hiv9vs2kh89gs90gepdheap52s/99354882090.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/winifulixovexotuj.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/39508152211.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/96212224677.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/falagepemuzexotox.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///rejenogituzakitofokugefaj.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/sojufukofuzabupesavunuwu.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/gudasejesakiribok.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/22ttmabfhiki6g2e1v5tu18alh/87092057714.pdfIn PDF document text
    • https://funbugs.ie/files/file/xixolisedekejirofo.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mebosorexarojuwe.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/75482131957.pdfIn PDF document text
    • http://lblussana.it/images/file/lavetubibopebafaforet.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/67559119901.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/sixafikigelokezizabepeva.pdfIn PDF document text
    • https://tauthuy.vn/upload/files/83104183665.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=apk+call+appPDF 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_off0000d895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 9628 bytes
SHA-256: e92a4c63af4353d3ad04d2b5a27019cab75475a3905fb54389127a8acb342e0b
font_02_sfnt_off000105b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B0 16804 bytes
SHA-256: b7a870627023f3fa36622b513afdbf739e995f6f87971923e8a74c86e39c7157