Malicious PDF — malware analysis report

Static analysis result for SHA-256 584fb75ccc742f55…

MALICIOUS

PDF

71.8 KB Created: 2021-09-05 17:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: abe5e8960a37cfadc991411cf9f86fa5 SHA-1: b83ac149205b4437c958c31843e8e4f8cb2eadd9 SHA-256: 584fb75ccc742f55ff66d3af7860f50c8ef12e7a437d853485f92882a9c26e3c
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised WordPress sites or disposable domains, suggesting an intent to lure users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://pistant.ru/uplcv?utm_term=lienzo+de+quauhquechollan+pdf PDF link annotation
    • https://bimstudioinc.com/media/files/39492316156.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/24945163246.pdfIn PDF document text
    • http://ativn.com/upload/file/fukupifufebimajigu.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/bipatag.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/wusikegokop.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/95260817012.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082805b99062---jarogerotubivov.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/87d3cd618ed5e2f239a04e2b562c698b/badota.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/54070934224.pdfIn PDF document text
    • http://chiron-ventures.com/chiron/home/img/upload/files/210801163043358920tmdw6.pdfIn PDF document text
    • https://melz-feu.ru/upload/92777594676.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/85b9c3065ceecbe731208448c83c3495/limodigu.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/dukekekatetemususifu.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/27018792732.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/22fb5bd0f01548d1973aed9002e28f8e/37862393713.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/07k80eura0ba5mf50ka3v6v5fh/62660506202.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/31053141233.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/20217211834397021.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/63181852710.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/repenevukopufivufepudibur.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbe8b4bcec---wokumenemu.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_off0000b4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD04 10612 bytes
SHA-256: 706f2dd956a61b3b23924ab2fc664561cfdba793097e10ac8d06484debe72ab9
font_02_sfnt_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 17316 bytes
SHA-256: 7bd025ef13d550cf7dac087fd43d7717685ada74e00c28e86b68a9db7f3a0acc