Malicious PDF — malware analysis report

Static analysis result for SHA-256 367df2b09960c90a…

MALICIOUS

PDF

99.9 KB Created: 2021-07-15 12:53:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9aa123d72d5ba11274ba1711a22c25df SHA-1: de8891397701bdf9afb9063440130f1e75ec4a4b SHA-256: 367df2b09960c90a09f1622611b744b92426d581944638139614a3b862d84695
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised CMS upload directories. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves directing users to external URLs, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5706

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://alimentosldm.com/userfiles/file/rimoditawiwezujatesad.pdf In PDF document text
    • http://pensacolahigh1964.com/clients/1/1d/1d652d7f5bd5fd2f3712913460b20393/File/rufenisoderuki.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/efl4a3is19s30uh3nr12cmucn4/56041095554.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/kovujakogolunegumobetazi.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/36712986000.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/15169807584.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/garelixa.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/wenurobiwapotumum.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/90003484207.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/80576883209.pdfIn PDF document text
    • http://gdbchurch.com/clients/43262/File/11112710067.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c60038bb7e---takabamubevija.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/d8fa8f61b67fad0934f9ddd0a9ef36f6/juzobolezezurajobu.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/e2b4be88d21d086244cd4d3224dc7645/5995373646.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/13707624936.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b299ddcaa36---zofapokevetogifovibuzuwaf.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/60519099779.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/da2b5bf74db0dadaa485afc0c48fe794/vorararugumarikovigiwubi.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/folujutugurasajujominuz.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/eboqmfa1k2jfq5kum7s936p8e6/dowavut.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/461c04feafbdff95ca0b12b239037d1d/xedazejede.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160c047fc649be---80319771601.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/98128167986.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=what+is+the+greek+concept+of+ar%C3%AAtePDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001226a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226A 10960 bytes
SHA-256: 147fdb444c254de303e4aa68e1cf6fcca25b1485b9586f719976864914abbdb2
font_02_sfnt_off00013b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B8B 16096 bytes
SHA-256: 4ba2f64648f3913d62e340dbcfb60868d09d2a275a626c0843c73eb1759bed3a
font_03_sfnt_off000150ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150CA 22028 bytes
SHA-256: 2199654f93c79a29c01ad273b3845b30e57e6b3f47c28f2deae24d9f6cc4e8e6

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