Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6d453edf9e2c872…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 21:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 88f53831b7068bc2e8b82d9be5b641cd SHA-1: 475768c8bae30ff5342f8d9ce8469ed3711d2bfc SHA-256: f6d453edf9e2c87205f56146e47e07b3e825650dac25ad48eab8d89f000c693a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://presentkompaniet.com/img/content/file/jutegowinivod.pdf In PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/9e98c190972fba0e510fa0bb4b0f9b01/20881099213.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/23255928236.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/gikimumudubopa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a81fb49fba5---motulexarenipuv.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/45f3ea5dee4aae984e0fcc4d98011e06/20234594021.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/gefukubuwajojosom.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/d5f632ead6557ca960f170624eb716f4/daxunovizeninoz.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/46153031319.pdfIn PDF document text
    • http://lev-steklo.ru/userfiles/file/vepisodujutazenugogife.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/kogegigogozeje.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/33855902690.pdfIn PDF document text
    • https://castel.ro/userfiles/file/51011836836.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/462fcbcfca4f23c67c19ce2c6ca2b7bc/wuwuzewotiwosufun.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/mafijikamovodavajexexuma.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/26108603743.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/milukedosixiwe.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/84736623906.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/ratejegapojapulegoluvadol.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/vazojogutuloxine.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/3958279534.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0605/d2d75ffcd91f6ff764c39476efa08a2e.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/pofatawekuwesap.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/250e48754ace6b045d86bb7b92186211/zopesiwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=convert+jpg+to+pdf+windows+10PDF 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_off0000cbd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD1 16744 bytes
SHA-256: fd6a5347a70ecb2d606d2509c0e8779bd693b6a83d5b95560d9737b7c50d4df5
font_01_sfnt_off0000f73c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73C 10952 bytes
SHA-256: 1374e223263e40a301e91446531657d50f9ac67e6016591377fbd27adbb1a808
font_02_sfnt_off000110a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1