Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ecebfade48fbc75…

MALICIOUS

PDF

70.9 KB Created: 2021-09-10 20:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 42c83a6c32da27ae15ff3c1b6ea9e2b9 SHA-1: 7134ad6db2f50e5216539dc06157341d7017a8c7 SHA-256: 3ecebfade48fbc75b407aaa87e54759b884e7bfe87c4a48f7eb2489475800315
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to lead users to phishing sites or download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://chcial.ru/uplcv?utm_term=alien+vs+predator+snes+rom PDF link annotation
    • http://carrozzeriardue.it/userfiles/files/57231894726.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/66684294ac3a2688046428b51222e240/26156229040.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/zarafemebuzewimuliru.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/duzorejakaligozuxajopuzag.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee02aa1ca1---87825728488.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/4987883023.pdfIn PDF document text
    • https://ka-base.no/images_students/files/kulotisa.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/xewen.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/referuvewilir.pdfIn PDF document text
    • http://argol-editions.fr/userfiles/file/kewakugorafomajitewemabor.pdfIn PDF document text
    • http://vaynhe.com/upload/files/tawukemadibepifewur.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/75055860279.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/63000807980.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0752433001631168742.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/ruzumakefadisadike.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/lesared.pdfIn PDF document text
    • http://land89.com/ckupload/files/weminibepo.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b20084c0b8---30104969920.pdfIn PDF document text
    • https://autopsrus.aerovents.com/ckfinder/userfiles/files/nabixukemurog.pdfIn PDF document text
    • https://htchninc.com/d/files/namejo.pdfIn PDF document text
    • https://rugerwafers.com/demo/ruger/beta/userfiles/files/funukozaronusazijigal.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/54912342247.pdfIn PDF document text
    • https://ratoempat.com/contents/files/dutenude.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/59267005553.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/36330401846.pdfIn PDF document text
    • 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_off0000b5b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5B4 15504 bytes
SHA-256: 34cf290b1d248b97be8c98eec9d45c800830abc2a09c8834e8e84d5eb9ff701c
font_01_sfnt_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF572 10600 bytes
SHA-256: dc03a7d46ab27a7a4a2a0e8626bf4b66416d4ed6193adb78e912c3630a2b4f74

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