Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf2ded69e13703f5…

MALICIOUS

PDF

118.9 KB Created: 2021-09-04 21:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 09c3695209975bcbebe206e635d029e6 SHA-1: e5b760fd5343c1dca107347f41dad5d73d7902ba SHA-256: cf2ded69e13703f560d2884195465a87ca5fb7f4a90133318093f338efba9d7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV both strongly indicate maliciousness. The PDF contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or deliver further malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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 http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c591f91cffe---komunamejasojojijepuv.pdf In PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/97c47fb5a753a738fa2fd5fdea0caeb6/wudilosaguzukix.pdfIn PDF document text
    • http://dpsszczytno.pl/photo/file/97660735450.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/fusonanomowisolowexaj.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/50834102983.pdfIn PDF document text
    • http://dentherapia.hu/files/file/45437400868.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/zanuvaga.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a203be606d9---11978689440.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/7044386a97127625404aad2a9fade57b/gokilunaxigebetixegenofo.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/12508900324.pdfIn PDF document text
    • https://baongochoa.com/upload/file/xozizewukunivojatoxiviro.pdfIn PDF document text
    • https://emmaushuis.org/pages/rezepevu.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/gaxabaserug.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/b598a891c9cfa1d5a9696848f5bd4dfd/10173715287.pdfIn PDF document text
    • http://contactconfiance.com/files/files/xerogozolurij.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a9e318b33e5f4278eb4ac873d8c564b5/84661715685.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800bb562f4f---83827858712.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f98920f1469b4c9ae34d3baee0068ce6/60861153759.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/cr2lrlj6tgpn25civ7r0tnlv30/97462600244.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/d4c76045c14637279be4b1411d9a16c2/42558473149.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/c50a31f61b3edfe18cc493b2a8a9fdf4/bafaxeroxano.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0c113801e---14228788795.pdfIn PDF document text
    • http://vizcsap.hu/files/file/radetojisuto.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc8b6ca9fa---nejezejabebukabemodovomu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f4692799c90---25090954742.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/037cff4e66014c2c5cda38e0215b420d/4099344615.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=fuzuli+su+kasidesi+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_off00016927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16927 10300 bytes
SHA-256: a93071e01fe92768a061c15a4b6ceb34a7f63a4334151be8508342531dfccad1
font_01_sfnt_off00018071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18071 22140 bytes
SHA-256: 746693ad80b956674645fbae594b098f0576c93966983143c908e44ef5a5cfb3
font_02_sfnt_off0001b3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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