Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc4799499bde8a8…

MALICIOUS

PDF

86.2 KB Created: 2021-07-10 03:53:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c926c71f145b2946988ecbd6714e6cfc SHA-1: f57a1b5b2c68de3f99a7cbf9b89a15c5bae6e285 SHA-256: 2bc4799499bde8a85a7ad7a35739e75473f1fabf7d88591cbcafb8e39e3b3441
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many hosted on compromised websites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple compromised CMS upload links and disposable hosting further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/v8sioeju37opmo0rlj2bdl0a59/36917194634.pdf In PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/f4m6a1nemh05t64gpsnrmtuvt4/todijokibalox.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/1ee8bc74a6906eef7f449011083eda2d/guvazexupike.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/66338009406.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160851083f2af0---doduvonaforirevigabokud.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ec72ab23---19920105571.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c92387cce---16350476713.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b4f379f02---74816981181.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f99a2561a5---rugatixufivifogakujufek.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/tulimasufikiwofinofub.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/t17iql0p1mcigo3299fn6egka2/lotexupaledepefukalig.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/46e9da4eba42071419c0fccbe4c26796/niwisutogisexusuja.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/xepokoxa.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/fibalinunemeko.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/c4bd0d3065e852101e99d5c94b059ebc/87637239763.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f78899478---7295278709.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8713e17585ed757b36c40319c1ee3b77/18299745843.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/34655989315.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gagom.pdfIn PDF document text
    • http://anm-av.de/uploads/files/15297033212.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/b7919ff16aeab0a5c73e0a048a0c67ab/depog.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074cd9231f5a---funixifanabiwimaxig.pdfIn PDF document text
    • https://triosms.com/userfiles/file/71186648181.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/79629125975.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/venotiwokop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=examples+for+prokaryotic+and+eukaryotic+cellsPDF 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_off0000ebf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF3 17300 bytes
SHA-256: 7793b36c4b3d23ecfc0f4cd1ba25bed5bfb6e9ab4162b22421cdf19864a132e3
font_01_sfnt_off000118d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EC 11172 bytes
SHA-256: cd752a4029fc36e834cdb6fab65938ef2a443341aaa9fed687ac4d60191b2894

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