Malicious PDF — malware analysis report

Static analysis result for SHA-256 4619b7271fe8cf95…

MALICIOUS

PDF

88.1 KB Created: 2021-07-31 04:45:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a44755418217e71d7421f4bc0efd865c SHA-1: b382890d87548b9bb190b73653bd03a378d52075 SHA-256: 4619b7271fe8cf954785f3be35550a78e964f5648ce83e703f6c5780170f6e2a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains a link farm with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to lure users to malicious content. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160cbb0f91e662---nopazogore.pdf In PDF document text
    • http://misspacificus.com/clients/873634/File/99608495727.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c034caf0d71---13198250573.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9ad46cb36---39503213611.pdfIn PDF document text
    • http://museeducuir.org/upload/files/99441990698.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/73874019714.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16097ed473b166---rivogifogi.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/sivakowi.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/9aad2f97ec86ea333f99de9887c2588d/medoke.pdfIn PDF document text
    • http://superpart.com/files/wufilekukidinag.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcbe1e26d9---43372922307.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/a109f890e20057acfe40e0d5ab8df10d/71144506498.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/9104850457ac6671a3f66c0f39f57d5b/jodijavikebujodusojolo.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/90377208640.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fafda14f8---54303654702.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/c9c01bca615026efc997106fd1e5172f/rifejax.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/49808712168.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/piralosuzavujaxosojubebad.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/0a9e629efb94f7a3aab0b2a04be4999b/88423760051.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/4f3f562a70e62606d6744f8efc1cd383/23236995534.pdfIn PDF document text
    • https://myphambambi.com/webroot/img/files/56716240116.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/08938e49259bb72327ad6dc7b2decf61/56648664947.pdfIn PDF document text
    • https://j-kowalewski.pl/uploads/userfiles/files/dudolusum.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/mogotepuzimaxemujet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=declaration+of+independence+primary+source+analysis+answer+keyPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/1a894d627f347f42b1181df8925fb906/sojosofetopod.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_off0000f28e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28E 11172 bytes
SHA-256: 5bd7a0b7bcc8bafaed124b887be3a8606f76eec6d9383623fba2d76c59d09dd8
font_01_sfnt_off00010cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBE 17284 bytes
SHA-256: 8b5e0bff94f5b895627737e43d7599f58eb947b074cbdd6b686996c01e0be543
font_02_sfnt_off0001395e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1