Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a660072dd4cfa15…

MALICIOUS

PDF

86.3 KB Created: 2021-06-29 14:10:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cc08a7bfa2cbdb70989ba7ab0a11aa5e SHA-1: 08d191f5ec8c21634d19116d864880d9140e3020 SHA-256: 2a660072dd4cfa159c2b274f83d88379cc46e9c29f2676ecb00a87ad1d953371
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to potentially compromised WordPress sites, suggesting it's used to distribute phishing content or further malware. The presence of external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=she+is+so+beautiful+in+spanish
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/94d66cd3cea42e79c227433a4fa684e6/wudozalimapasulupujugufa.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/khjfsg38e544vuine41l5dra0b/50671907404.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9cc26c718a---rafodemawuvajifozodeduxis.pdf
    • http://alexanderkanevskyartgallery.com/clientMedia/file/47940466194.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/af547c1515f91b6ca9a8ad1944064c8c/besafufape.pdf
    • http://angelcabrera.com/FCKfiles/file/66362075794.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/18868988409.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/f814e3adf933e47a08df9c92c023c9eb/59215122598.pdf
    • https://ijmscr.com/ckfinder/userfiles/files/venefo.pdf
    • http://bigxra.com/uploadfile/file/2021060109450573499.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6d2rfs11k7alktemt9gjiirlj0/wewumidaditigevolebimexen.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607712e146f7e---talopen.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/e70ceae28183792816fbbb0d9976e3f1/87884637050.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e1d61445e---nazanixuru.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4617f3770---murosegexomaz.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/903114ff4c5d354fe4eadb49fe4aa5d4/8029054902.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a206e6b5a9e---54999343797.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/hema5neirlnnsb1iq83efmnbt7/58962979885.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/722f106824ac6b8f0579c8730ba9356d/971798260.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/ioh708q1p1l9jcng4trp62ka4v/rader.pdf
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/9rcmuh716qrgfsdjjs2lh8sght/vubiwalajolupizu.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/05d66500290a9cbf4aae9b7bba85f788/satipu.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_off0000eb97.bin
dc67a724b6c26857c30078a76208535b030d4a69be3aab759e3f3c497a1616d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 10672 bytes
font_01_sfnt_off000103bd.bin
0464271b13a87d1f2a7252f7fa313b88c464bbabddd5ea5a42ee76c44b6353e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103BD 18316 bytes
font_02_sfnt_off000132b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B2 16792 bytes

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