Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34fa5e908535370…

MALICIOUS

PDF

93.3 KB Created: 2021-09-06 21:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: eb59b7c1f4ba970f34cbd58f7de38ec5 SHA-1: fa1e6c6acf257a4793223dfa74c0c0d2700c4d07 SHA-256: e34fa5e9085353707b5eeb16d618dc3d0485afd1251892baf2ad171d8a78128d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links. The document body is unreadable, but the heuristic firings confirm the presence of a link farm designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=george+foreman+grill+manual+gr38sil PDF link annotation
    • http://akademia-jedenastka.pl/zdjecia/fck/file/29922427498.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/tidevuxibijenovebimu.pdfIn PDF document text
    • http://calisnt.com/uploads/files/xavajururodiv.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/pudenu.pdfIn PDF document text
    • https://sahodayabbsr.com/test/fckeditor/file/nodirita.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/kidudowid.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97f9e0c71b---52027719967.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/10255097908.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a0529e8b58a---silizutizupijapajax.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a4e70e897b7a3288ad82770cb19a8cb2/lovalek.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/41673369574.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6c4tmm2vm56ovpnkbs1p8ngav1/23921240036.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/xovinugenetuv.pdfIn PDF document text
    • https://yuh-tarng.com/userfiles/file/wuwedisifelejivu.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/nulekudipibeki.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/wupurevejeradugarizati.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/90497117856.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/nuxuxewuvafegitajobis.pdfIn PDF document text
    • http://rzn-house.ru/upload/file/68705279072.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/fch4huhlkhopsoadmrq5m3b8go/68895448249.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4bb1cb53d---86572859314.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/16787719004.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf859f5476c---95750657827.pdfIn PDF document text
    • http://hongdacable.com/d/files/jabisoniliwawog.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_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E71 18448 bytes
SHA-256: 371df1b4e1c47301e805a5fbcf4daf93870d482ff7c32c68fd5f129d0355f730
font_02_sfnt_off00014e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E2E 10976 bytes
SHA-256: 86ce8b8e31bc6f070646ef47d0a4016f004d5ef9629e0be36d43dd44ce414056

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