Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc7025f30602e8d…

MALICIOUS

PDF

99.6 KB Created: 2021-07-17 23:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a6df6790f26d435b4b137e082e274e9c SHA-1: 59b5cb98de37da6d9a3194789f1c6bffd7532855 SHA-256: bbc7025f30602e8db07eb6b5a06d91718755fd93ce86bf9e5f86d133573cbc24
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with several heuristics indicating it functions as a link farm, potentially hosted on compromised websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://nesthomes.in/userfiles/file/85405498602.pdf In PDF document text
    • http://saovietgroup.com/upload/FCK/file/doresasoka.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ed0fce4a14b191ffdfcc2172940866ef/xuziditimakenazodo.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/17289420785.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/364fbf9727b21199aebbebb77f5a2cc2/ganedowerekuterijeruvugob.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/gesosagijulezevoletipoj.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9a1d0c040e---47071391802.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160ab967367f02---tilebabutumobeme.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/d198a13a1ffbaf95345ac602f6867763/mexebomukefe.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///31666302619.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/zezagetu.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160806e689cecb---93973959872.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/290558291476.pdfIn PDF document text
    • http://vejwun.cz/images/25957739045.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2ab1be8f9---jedinowimugigipuxebonus.pdfIn PDF document text
    • http://bulmarconsult.com/files/mabifidumitipizewapu.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/15346626778.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/37679544583.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/10454418703.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ddc9e6ffe---rikemelavode.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/cdc945e0c857ce38b76d7a0d0bc78c5b/60277394244.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/masulujemesobawivuparomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=solving+linear+equations+and+linear+inequalities+satPDF 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_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 18016 bytes
SHA-256: ee28dd3ec21868d63b73ed7674210bfdb5c7beb898c691d240a3f444913149a4
font_01_sfnt_off0001503a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1503A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16851 10808 bytes
SHA-256: d49694cc36e9ae09d83ba0bed18f7a545b9bf21172730bc6ef4ee31b839efc8a

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