Malicious PDF — malware analysis report

Static analysis result for SHA-256 1467b0a8fa79c03f…

MALICIOUS

PDF

80.8 KB Created: 2021-09-05 14:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: edff99fbde8c9c2dad5f3570fd267382 SHA-1: f31669fb3f7e72229766ead2836c160ab5528c8f SHA-256: 1467b0a8fa79c03fbab64be930c31205b451616a0a5da66a404ff66bce3c6477
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URIs pointing to various websites, many hosted on compromised CMS platforms or disposable domains. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=scion+frs+manual+or+automatic PDF link annotation
    • http://bigdoughpizza.com/uploads/files/bibofatiwidu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b31bddc5f46---lofavomovasiforufus.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/af49fd355c763ab0afc83b97978060a5/1128798024.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/206a64103d541fe39406705610c806fd/peresagobib.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/86816932705.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4770e91d106f04b113ba2fe496facdb5/jiritikoxevupopibi.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/11818341141.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087778833958---nexagapilevilesepiw.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62e5252ebe---35803016113.pdfIn PDF document text
    • http://oicenglish.com/imagexx/files/nonolafinepivupakerez.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/29748445385.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/38413364126.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/muxal.pdfIn PDF document text
    • https://mimpiindah1.com/contents/files/sutawutawiniso.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1f6808a33---74391636318.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/1ff6882668d72dc9deffd403e54db92c/53715992184.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/3442e6805b68819944e154d3672c9f1b/65133230484.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d88fd56ad0---tudilosasafujipumuxax.pdfIn PDF document text
    • https://merydian.pl/nowymerydian/userfiles/file/72423443243.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/25i3otbvthobt2g7o6rv2qbvar/70365259647.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b09bd67e10---famosuvozezodugo.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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 10540 bytes
SHA-256: d3bfe401dce346296208a5dc6ab2729b23d149ababeb2a4934fba267a00f15f1
font_01_sfnt_off0000f040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF040 17292 bytes
SHA-256: cb2efaf19e6f4f49d6e7523091e87a24a4835743430cbbd89fcf5d7fe60c551f
font_02_sfnt_off00011d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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