Malicious PDF — malware analysis report

Static analysis result for SHA-256 b372c5412a5f1cff…

MALICIOUS

PDF

104.9 KB Created: 2021-08-04 06:27:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 755ac1bede9883909700a3e9ae830188 SHA-1: b4dbf508671638c6431abdf91988ba09fd853064 SHA-256: b372c5412a5f1cff8404657a10488ae6692e882312469de5394577763bb1563b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It contains numerous links pointing to compromised WordPress sites, which in turn host other PDF files. The presence of link farm heuristics suggests an attempt to obscure the final malicious destination, likely for phishing or malware delivery. No scripts were extracted, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/e64f235e98a4b228c2aae9fc4f6516ba/62664702551.pdf In PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7ee5021fa455fa8e7a54966af840c4be/tivexexaxejovebusipoxuzag.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/zadotogilujomujaxajeturu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/d910abf41d9333f4a14f2569b5a1b90d/fiwizel.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/punanofatogotolawajado.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cd557249b---65561562075.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/sipasa.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080507b68305---23756459588.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c520528569445347a253225f990b9ec/73910157499.pdfIn PDF document text
    • http://wurbs-hanau.de/userfiles/file/gozeba.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/paroripogim.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/zojopej.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/larajegezub.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/sipusiwosaz.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/gurelarudaga.pdfIn PDF document text
    • https://anakmeong.com/contents//files/fapuzom.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d3bdfd8a8a932b723d1f63a316a8b940/34654657314.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/jikawuxumezaf.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf15b07919---42906036191.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/javerololinotaledojewos.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cdd726b6e5---39646714896.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/ab03844c4ac0fa0c3f8121bf4feefb17/xivuwipasavusikudoxepi.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/1501608950.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210527010009.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=el+aleph+borges+pdf+downloadPDF 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_off0001313c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313C 19980 bytes
SHA-256: 1629aef90a87da1b7c5b6ff820e2f6e0811a4e64743016236b38a5d6a9623699
font_01_sfnt_off00016356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16356 10796 bytes
SHA-256: f48d6b5a80dfdedbc5ae3ff58ce4085cb42c18e6fef8970f11b6b54483975ab2
font_02_sfnt_off00017bc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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