Malicious PDF — malware analysis report

Static analysis result for SHA-256 3035ed2df79db90b…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 11:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9fca058e920c71aabec107a2d3764a26 SHA-1: 8d68f584ebfce101f0db566e03acd2161e478e3f SHA-256: 3035ed2df79db90b0080f9f9743b2885e48ee1bdaa91919ed47b2057a53af4c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, indicating a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8qcootvkpeb3vh32rrbjc8049a/66368277455.pdf
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dda2c913f59---butemesifotonateliz.pdf
    • http://pileshoppen.dk/userfiles/file/vilivuf.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/837ac7a356d58b64faadc5bd9e203553/32501257307.pdf
    • http://anoh.net/pds/userfiles/files/wowuregatebakem.pdf
    • http://consulcongress.it/uploads/assets/file/68198968532.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/tepuxitineveponago.pdf
    • http://niengrangchuyensau.com/upload/contentFile/file/mukuzidegore.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/f3aea5a8702c3ec944a3651db86c830e/64032975829.pdf
    • https://xuanhongkhang.com/upload/files/21517459770.pdf
    • https://tckontrola.hr/files/lawimevemen.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/77850625809.pdf
    • https://beta.nhatthiengroup.com/files/uploaded/files/92342796253.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7c4102f87c0ab71752c63b589cbfe8b6/31014323158.pdf
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/ijj30t36aeljnfh1ab91vangjl/89881344787.pdf
    • http://kompletucetnictvi.cz/files/file/88967037195.pdf
    • http://phukhoabacninh.com/images/files/13199586309.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/16b597b54944b144134b9e91b84bc3ae/pokatinop.pdf
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160828b299736d---fizinuwovejer.pdf
    • https://aspirans.com/files/file/vizodukubuje.pdf
    • http://slenderclub.cz/ckfinder/userfiles/files/ridasuforowepakutefa.pdf
    • http://www.civilhospitalpalampur.in/img/uploads/files/mosipejawefiwezupito.pdf
    • https://viessmannboilers.ca/fck_upload/file/rupimivugizeduxijine.pdf
    • https://ptogel2.com/contents/files/16905026515.pdf
    • http://pokemom2.com/uploads/files/17074726764.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pencil+sketching+tutorial+pdf+free+download
    • 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_off0000c57b.bin
608c0fd8e4b7f68268a7398735509128bc10dc33469c4570aa387a554f4681b8
pdf-font-stream PDF embedded font (sfnt) at offset 0xC57B 18384 bytes
font_01_sfnt_off0000f534.bin
2c11595b1faa8f4b63b134ad5d1853863d1c0b21d21779ca8854d6fcd7d3abd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF534 11176 bytes
font_02_sfnt_off00010f33.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F33 16792 bytes