Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1ca9ee3d73d166d…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 02:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 14802214054b142e0edf15fd2f2ba389 SHA-1: 3790caf64168db65ff3bb3a2146a99175fc9b3cd SHA-256: d1ca9ee3d73d166d34ebfce2f3d1fad0b71e4d3566c444b79b1b319df6e834d6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9844

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 http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072af4ebeb68---43081834288.pdf In PDF document text
    • http://gibeaufamily.com/clients/870383/File/53529369828.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/zukaketixuxakepin.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/170048137860d0668202730.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/94965217816.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5459e6979801d14f8fc83983f4741dd0/juwaf.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed6fa34694---84964486808.pdfIn PDF document text
    • http://change4best.ru/upload/file/28731890988.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/55286415949.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/3e355cbcf4d127f632924e9bc81f0962/begexopen.pdfIn PDF document text
    • http://kwiatmetal.pl/userfiles/file/sotavanufejo.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/54259820611.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/tivijironowukotupokuxo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c28816c85f2---67414422468.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fb75b05e1---tunegulojujozab.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160856fd2b82a2---44099559649.pdfIn PDF document text
    • http://ecohouse-lab.de/userfiles/file/tazuwepoxejejowunuxemuro.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/15474665217.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/ligamutuvopomov.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/zikojeri.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/62615097383.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0375a88b4---99461072404.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/d802219f15e67e9ec316d1024ccc17e1/bujizukitoreva.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/85939006174.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/94059251419.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/27670235068.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/68382140818.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=alveolitis+al%C3%A9rgica+extr%C3%ADnseca+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92F 11160 bytes
SHA-256: 8403a0e617e589d3c4f6abb8baa319e57d0d654e15035d47427692969a0d90b8
font_01_sfnt_off0000e2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E5 17956 bytes
SHA-256: ea83b104e49cac998a0e8c98efc0c140654d6b375de815fd6911c22685a1f64b
font_02_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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