Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e33f6393263e50…

MALICIOUS

PDF

92.5 KB Created: 2021-06-26 14:13:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: eac9e8b42b272da6127289f66025673d SHA-1: 9f50d0500cd1021a7f00af3923a37e1a256f94ed SHA-256: 41e33f6393263e503e0327601fcb06a3aeed02162a26a39c2a1b49081d516964
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or serving a second-stage payload. Although no scripts were explicitly extracted, the nature of the link farm and the PDF format itself often implies the use of embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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 https://huntic.ru/uplcv?utm_term=max+villagers+acnh
    • http://shuimotongyuan.com/userfiles/file/55644553894.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/df0e25842b6ccdbde68e2ce584c00b21/ditawepafuxugi.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7s39glc92hqgq3tr4oj3gtu7ef/13440794595.pdf
    • http://absolutelyneon.com/userfiles/file/9378287510.pdf
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/nivubeluvepamutotezevek.pdf
    • http://s-privod.ru/userfiles/file/nozosejetaxex.pdf
    • http://bfr-bialapodlaska.pl/userfiles/file/1300734182.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe56fbed30---vezonutotogezitazakax.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/s5ij1efjf8d98qn08074hheh58/ridum.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d2bef3554---pufiba.pdf
    • http://minhanh.com/files/fovewuzunekulibejubuzisi.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e90018f63---85975828099.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/1633463d21bf5f1de7359fd3fc863222/zunaj.pdf
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/8tt1odk5jelhsbd720ot0oel83/66496285360.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd933a16ed6---98650562163.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/79ecfdbef442157caa254ee89ad18568/sodisexepidinarazapoxefo.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/2v3lnt6runre9nu4non2soge55/febisulikeb.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/v5ibn9tjobfn0v3m3v6t8l80d4/46255618084.pdf
    • http://fdscience.com/UPFILE/userfiles/files/35353483334.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/2e1146ef98613f7ca15589977e58e7ad/togepagakajovalew.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ac910af4cb2e1d1c93f3cb20c88d8f53/nivutuxepenefugivirovawo.pdf
    • http://technoculture.cz/admin/upload/file/bokoki.pdf
    • https://cubic.is/userfiles/file/77333465083.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f99a.bin
5471bbb3fe2db4d1822bab8c5d448d0acd94a85ac3509a3eaa1d637365a1298c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 19428 bytes
font_01_sfnt_off00012b98.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B98 16792 bytes
font_02_sfnt_off000143af.bin
6300d17cdd92471d27cfc4511a1dbadb402e57574d45d586d034fa8257af0331		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143AF 10452 bytes
font_03_sfnt_off00015b47.bin
5221cc56e96b657ff7c15f49bf1fbf1b5222e15cd7ffd769ce953162a3e53832		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15B47 2064 bytes

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