Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a2257c64272a01…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 04:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ffc2665deed0b9fe7828f36564d492bc SHA-1: 77b74a93ea70b6ec480e36ce0c683bd68dad970a SHA-256: 70a2257c64272a01e98281e6a572776a4e06213ecc514ff952be618d5e78fdfc
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 both a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms strongly suggests an attempt to redirect the user to a malicious site, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://marathon-gexin.com/Uploadfiles/files/mexigujawufekepubizorixi.pdf In PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c86b8063962---59378959609.pdfIn PDF document text
    • http://dallassymphonyleague.com/clients/1/14/14bb4a025281f1a32078cb68571f7cf3/File/39343772625.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/15a2c3323b05615559bfef4191d6fd98/gajururabogeluje.pdfIn PDF document text
    • https://fototipia.hu/files/files/53549331557.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c95e92d56---40145726489.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/kugazifizijokodumosi.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/fopatuva.pdfIn PDF document text
    • https://peterdegendt.be/file/zopoxumemovalofiroja.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/10541755899.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/99771877295.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85f0d9e74b---katepowomiburetupelomujet.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/b31b5e4a156568a863c77f2db3f143ab/22296756073.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/xapoligeduniwenesil.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/laxawimekakuvurojewefuna.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/zomoko.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/f34d84d4753bc0182b161be600f23b86/fawefugerosafu.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/23323452799.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1516502239610e0a5053a3b.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/7c291f3ea306b2be3c42a30a1cae80eb/rinilenosodunawaja.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/61369586555.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/wobilizupiziz.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/99035980212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=panduan+menulis+esai+pdfPDF 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_off0000d30c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30C 10444 bytes
SHA-256: 16d1efb78f47566f8c7d6c1b4b5dd1b7095c03dc8e5775ef04d194bd145d6fe8
font_01_sfnt_off0000eaa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B3 17220 bytes
SHA-256: 63e386855c0f47ed39d976c24c538335c1b1d5a1c4a875d027723f2b0a72dc96

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