Malicious PDF — malware analysis report

Static analysis result for SHA-256 376520b1cfeb9dc2…

MALICIOUS

PDF

107.1 KB Created: 2021-08-19 22:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: cf08edb7ad05f674fc92cb0d63ad34fc SHA-1: 411e91e7424608372b2338157708cdb14b732836 SHA-256: 376520b1cfeb9dc20b090caa6243c8afc917eaa1ef49dc867b6ec9a3ec8f97a5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The document body was unreadable due to obfuscation, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://lab4050.com/upload/editor/file/mezawujoberulati.pdf In PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/2044931051.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/029ddbe4f3b02bd64d4b762401862927/49859731517.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609493c19a8c8---zinerevuku.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210606_33736E97B3E5DC57.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077a20bacd78---40213397873.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d23b1fcd312fcc21ab38d0b58768507f/17258151079.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/josafo.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/37edbe067cd624137a915e5770536186/74897895237.pdfIn PDF document text
    • https://clove7.com/userfiles/file/degiwanoporalubotugujik.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160c10982b9836---fuxefuweriwu.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/62708891096.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/57865074051.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae282986639---86541118352.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/safotapolapotutipematap.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747cdb01f04---90651705649.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/oa0u6hbo8q84v159ph10jbm9m7/sosipu.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/43876133981.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc3f1d925---5568189949.pdfIn PDF document text
    • https://micsys.in/userfiles/file/romezakejuxid.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e515a04fe1---95322430366.pdfIn PDF document text
    • http://builderall.info/userfiles/file/65853873291.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/78478913016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=call+of+duty+4+modern+warfare+multiplayer+cheats+xbox+360PDF 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_off0001362c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1362C 19884 bytes
SHA-256: 94a33166045baddad9df0738b362bf448b7fe74906c548205017076e1ef93255
font_01_sfnt_off000168b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000180cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180CC 11996 bytes
SHA-256: 0efdfce78f8f58d232c338830550355058bff9753203340a5a54ddee297a1698

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