Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f75a02c79ae33e…

MALICIOUS

PDF

89.0 KB Created: 2021-08-21 13:36:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a57b2cbb313364cd8fd5d6f5fc6ec4f2 SHA-1: 2896c046e769906167855a017496c0ac963ffc5d SHA-256: c1f75a02c79ae33e7a7ed3666a40e8f235d70c00e3643e69d10e1c099f5e29a0
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. It contains numerous links to compromised websites, including a link farm hosted on disposable domains and WordPress upload storage. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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://sanitaerprofi.ch/fckeditor/editor/images/file/83210588210.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161035bffdc543---67722411235.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ccfb779351---vofelovili.pdf
    • http://aldo-ins.com/userfiles/file/nerojemomepiluba.pdf
    • https://anjingliar2.com/contents//files/fititokizigarejifade.pdf
    • https://fizjolech.pl/userfiles/file/97362198162.pdf
    • http://brenno-tojestto.pl/userfiles/file/todapifiretuwuzosogidi.pdf
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160786a5dce303---4464210007.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/eemsaik8a7jefbjsb7s7a5p1h5/40246424198.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bf5df2ebf---dazitijivobonuzatojasu.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1aa025c9d---99712170341.pdf
    • http://sevgineslianaokulu.com/ckfinder/core/connector/php/uploads/files/vixakoresuk.pdf
    • https://suacuacuontoanphat.com/upload/files/91765792205.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f4096a13b3d---nozimikelopexafofog.pdf
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084006944e1c---wekadopobufanofirelugi.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/oq01gha2ok92g7b82hec7fujd7/wijumomiridap.pdf
    • https://webfox.net.au/wp-content/plugins/super-forms/uploads/php/files/a9519fea25d110c61101155f4f1ef651/jobexitifupibaxeruzibug.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4724812783---78536888731.pdf
    • http://bora.su/ckfinder/userfiles/files/dalib.pdf
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd5ad89c86---63259698885.pdf
    • http://www.pranabkumar.com/fckimages/file/53531436537.pdf
    • http://ahlhy.com/uploads/file/011553567689.pdf
    • http://snsi.jp/image/news_file/jajoki.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/8044f3d80c43605a10beb98d87f401f2/54053540838.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab594de3106---11922564823.pdf
    • http://sbox-technology.com/upload/datoteke/tudaxujujisetixot.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=soft+drink+industry+analysis+canada
    • https://doi.org/10.1136/bmj.n254
    • 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_off0000f65a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF65A 16792 bytes
font_01_sfnt_off00010e71.bin
d2fd88ed42819440a38632fb65ae98e5525dee58f2db919a1e7c3274deca2752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 10716 bytes
font_02_sfnt_off00012728.bin
a9ded9028afa9c4893d2bf054b097d3690d424a7f614c428626f912d044a0a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12728 17612 bytes

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