Malicious PDF — malware analysis report

Static analysis result for SHA-256 244cab3737cc2996…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 19:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3d6b85b49fb72ac8e533c8de5d91436e SHA-1: 88deee8bc6c983f9d93e62c0cb7c8ccc6aec8c71 SHA-256: 244cab3737cc29963ccfad0719a5f3b4efcdf94a8b97b3cabbc27a6a24dff96c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm on disposable hosting. The presence of JavaScript suggests an attempt to execute code, likely to download and execute a second-stage payload or redirect the user to a phishing site. The numerous links and the ML detection strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=icarly+full+one+direction+episode PDF link annotation
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160753436c28bd---gamudojigujit.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/9j4jo5kavaunimr8p36dmce3n0/7827221964.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/26275977530.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/19493401714.pdfIn PDF document text
    • https://domilot.com/uploader/files/dikalasazel.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/178763fd11a00dae1971921f3269c27b/41263748454.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/25866023738.pdfIn PDF document text
    • http://nappsa.org/userfiles/file/44885865529.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/8666216327.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/76786673494.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/72205037418.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/19133346811.pdfIn PDF document text
    • https://masihpt2.com/contents/files/18336310061.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/lirid.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c638f3298d---79116757514.pdfIn PDF document text
    • http://recviem.ru/img/upload/kugekojizeraxatuzuf.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/bagowafar.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/75f994295b7354342789c5db1af799fb/58312974707.pdfIn PDF document text
    • https://dptech.vn/uploads/files/68919277378.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/thaeq00rvb1ftsou4k3l81mv04/komutil.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/vusivotilosuwifud.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c686a7d12b---nidotozuxinapan.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_off0000e7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7E5 18120 bytes
SHA-256: 356869c40efab226c06e0410061d40e88294b0b797d8d178180489c6080a20b3
font_01_sfnt_off0001170a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170A 10780 bytes
SHA-256: cb6164b0a198f5a06dda6ddc4da1c1271ac4c766b83daa025a87cd8733855ae8
font_02_sfnt_off00013008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13008 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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