Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ca2911cfdcd3b0…

MALICIOUS

PDF

108.5 KB Created: 2021-07-04 23:06:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: b2c189e7808d38712eaf60cf5e74ee7a SHA-1: 9601a460331a3e2cd0c42dbe5970f2b2294b7d85 SHA-256: 86ca2911cfdcd3b043211822a7ced67d5d20b4e32848686887f08504cf970220
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and other domains. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites for phishing or further payload delivery. The presence of external URIs and the compromised CMS upload links are key indicators of this malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

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://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094321dbc511---88387247862.pdf In PDF document text
    • http://turexpert.md/userfiles/images/file/buwogowotoz.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/ca8dcaf25cb718b4a470de0e4d5bbc0c/67146670008.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/72559202541.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e45e0f932a6bfd49958a9b3cd0cc56b8/lujuwakiwivizuralefeg.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/rozusubapebirex.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/6ffec89d3ce9f9a4274f97a469d062fd/21787339184.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/fc082ca00d5f4b7ba321acba1d7b519c/54151406040.pdfIn PDF document text
    • https://christianklein.eu/Quansis/ckfinder/userfiles/files/94616496156.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4320d056cdbec4d1688c8eef0ee26b4a/13844761283.pdfIn PDF document text
    • https://avenue102.com/uploads/file/fadekuxodig.pdfIn PDF document text
    • https://ridersshop.it/file/rozojamexagul.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/25934604245.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607a712f5fee5---57070976443.pdfIn PDF document text
    • http://ladakhtripmaker.com/userfiles/files/xosufibajigokebiwamuvo.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79f9c276d9---bumipetumiberonirowuj.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4099a7f9d---mexidibevufasijobebexet.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/7fc7b38ae2d3b6ae4d453c4fc9075e95/5004185085.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/301718852.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/0qtg64u4mv8sjag15jk63e44cm/8374383973.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/6bcf3a0f61686d64529c9be92a34bbbf/40681844245.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/sm5k5ohf7u2ig70lsmlfnlng36/95755996212.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/lilixotogu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b946a6775e8---71623511922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=monday+without+youPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 31372 bytes
SHA-256: b1b59bb5823c1e99536f5d6143aab1f7d73774ff5510f54607e647650c4b06dc
font_02_sfnt_off000149b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B6 16160 bytes
SHA-256: 27fa49ca30b1f57c6e4f8b99ad1f73ead7010ce1f191e20d716503af09158f46
font_03_sfnt_off00015f30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F30 10192 bytes
SHA-256: 24a2242629c7ec79f55193e1a2be049f462639096906d8fee0cc2d3c246e9f56
font_04_sfnt_off000175fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175FA 17912 bytes
SHA-256: fbb653b8ea6e25259a8c929dd20aecaa69b038d1b878d4667d92715c94356fdc

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