Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5216e4542a3feb6…

MALICIOUS

PDF

86.5 KB Created: 2021-09-20 13:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba94df405b660b9e4ef6ab57c023d331 SHA-1: 9f30c66cad7b128815b1cef852dcbeb90c5329b6 SHA-256: d5216e4542a3feb6eeaf00d1ffa4ac7bdc437cce6d40a74b56926803e99a1fab
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=pasar+aplicaciones+a+sd+en+android
    • http://studiobaldizzone.com/userfiles/files/sebizesukotugumoj.pdf
    • http://space-edge.com/upload/files/benifanexunevixavoliseki.pdf
    • https://coop-alternatives.fr/images/images/ladegajelujotil.pdf
    • https://www.tristar-technology.com/ckfinder/userfiles/files/38329556742.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161463bd127784---gipirobegipalukek.pdf
    • https://nidi.mk/ckfinder/userfiles/files/powimava.pdf
    • https://mkontakt.pl/dat/file/67961531354.pdf
    • http://syntrend.critical.tw/upload/files/61071330557.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/bpq9c29p0t0olgn9n3iojlipko/jugakevusofelikelawabori.pdf
    • https://aurorabersinar2.com/contents/files/96985108577.pdf
    • http://myucmas.com/userfiles/file/70891053462.pdf
    • http://nigerseedindia.com/uploads/51943938422.pdf
    • https://ap-qatar.com/userfiles/files/97551888898.pdf
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/xajizipopimefavu.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/vixibunolelun.pdf
    • https://gabinetpro.pl/kosmetyczka/krakow/files/bopuneruduxirujijemeko.pdf
    • https://suksesunited.com/contents/files/sejujam.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16130230f7f2c4---kunulezoxi.pdf
    • http://mrybalko.ru/files/4854502956.pdf
    • https://ap-qatar.com/userfiles/files/senozozu.pdf
    • http://deforma.it/userfiles/files/61900274681.pdf
    • https://mabuksusu.com/contents/files/89064457204.pdf
    • http://fashioneducation.ru/userfiles/file/27178876169.pdf
    • https://solidpractise.com/files/userfiles/file/85147577418.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_off0000eac0.bin
a51be58b36c8382c8e9027664c16bbd3ebae0c0426db4c22f0512732c3c1935e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 10412 bytes
font_01_sfnt_off0001025a.bin
f9ec3eae58b8e55574ef49b95843d57460b24bb547b8a7c1faa95df945610a25
pdf-font-stream PDF embedded font (sfnt) at offset 0x1025A 19176 bytes
font_02_sfnt_off00013406.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13406 16792 bytes