Malicious PDF — malware analysis report

Static analysis result for SHA-256 a340b7a077927a2e…

MALICIOUS

PDF

83.5 KB Created: 2021-08-02 23:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 90d113c9660b9ad4019a9a25aed85a2f SHA-1: 81a61c901cbeb49ca8a5a5473c3023c8876a91f9 SHA-256: a340b7a077927a2e86e3200adc08d8828e01b1574dadc18c086a52fe52c88647
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm, likely intended to redirect users to phishing sites or download further malware. The presence of compromised WordPress upload links further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://oniceh.ru/uplcv?utm_term=mortadelo+y+filemon+mision+salvar+la+tierra+online+gratis PDF link annotation
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d46aa9c9223---98228105090.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210501001541193.pdfIn PDF document text
    • http://www.mmalappeenranta.com/tiedostot/files/31618734449.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/7a7a6d63b970a3603263585686584c35/98245141554.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/31069837524.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16082696c5ca20---visesi.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/lasamadop.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf175ee15c---48570305975.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb30c3e1b09---tusawejadudofo.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5bf4f3ca6---punipesesoluseno.pdfIn PDF document text
    • http://bmhs71.com/clients/c/c9/c97ff408e01126d63256cf68004d6641/File/vebuvopisazowuxopijaloja.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/22507234659.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/63364276517.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2bb76a62b5---58511750104.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/10ddb24f0b072de75e08924b4a8ff64a/14094447902.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/42292105671.pdfIn PDF document text
    • http://classtool.info/upload/files/wonotozasobuniwanibewi.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3408dfd56---7396327889.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd57e42a05---budoj.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/69999997529.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/betolorukiwufuwivojuwo.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/xuzifopajitenulepisoga.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/vivuf.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/86138521959.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/88173273942.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_off0000e282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE282 10872 bytes
SHA-256: 299d8ee57f71e5fd8fad300dd1d41158bb86bedd62ee3a37836caf412d3bf439
font_01_sfnt_off0000fb76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB76 16620 bytes
SHA-256: ca344a1848acf9a05619e7f35d994516f109fda97575681e3e366ff1f1d39101
font_02_sfnt_off00012587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12587 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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