Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f874ac74d55311…

MALICIOUS

PDF

84.7 KB Created: 2021-09-01 04:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ece7cb3949d9ad1ac4ecb39a136468e8 SHA-1: ec5bbdc531150a74d583b63f664ffeb750e14653 SHA-256: b1f874ac74d55311bfaad3befc2bc8a9f98e194f6822c85ef59edd42f0d39ed5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Multiple heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, designed to lure victims to external sites. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chcial.ru/uplcv?utm_term=apathetic+towards+others PDF link annotation
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/f97cc43fcc5262673f6e370c69668c5e/zifabonimamufizefaba.pdfIn PDF document text
    • http://novussiteyonetimi.com/uploads/file/94760538841.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073b27950e7d---81966343550.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/73505486115.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070719431313.pdfIn PDF document text
    • http://ropesadventure.com/d/files/910565817.pdfIn PDF document text
    • http://drkoopman.nl/cmsimages/file/zazimabikaka.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/jamunodox.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/9b838775c6bb1e29e20e128d461228a9/gavodokipafevotawowefo.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/81831225165.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/1909d45efd11cd3738321acb9ddc9731/derore.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02777bc094---39416079563.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/10718515512.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/72245983082.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/87299205926.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/66558881340.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/fagomed.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ijkmlbho12fv64i7ls3is2ling/46444041984.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/bowidogiviriri.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1644919148610037fa66539.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/dd2a1f39c598721a22e306f5191ccde0/zadojuxivuz.pdfIn PDF document text
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/79502325000.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/e814b3uqjnr4il2cbrven41ev5/76758539026.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/pukunad.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/7f9afe8cf377b3b5a6aec7e465332e5c/girasopinot.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/fefb0166e5a2a8de3e2273e7a6ad87a7/61554155143.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_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 10528 bytes
SHA-256: d0b0dc81fbbe20fe56b7ab250e201b67bfc8a63681f67c84a257f0afd09f283b
font_01_sfnt_off0000fdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 18468 bytes
SHA-256: f386985a7f4d30e074ebea41d4fe799057b433ccd8a3283696bc08fa61d3df12

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