Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bae37466f70490…

MALICIOUS

PDF

85.0 KB Created: 2021-07-07 04:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ed231cdd971e418a03dd0cc6f48c047 SHA-1: 16ef75ff2f6cbce6201278d0fd71a9f7971b221a SHA-256: f8bae37466f7049070b88325b443398ad5c49657d2f6c19cc3b8970d37968200
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites used for hosting PDF files. The presence of external URIs and link farm indicators suggests an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/addi9uhu9he2chbrsvlim60upr/kogoboxikiboniravadadage.pdf
    • http://wamer.org/userfiles/file/9392346031.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092ed4690127---tewejetadopuj.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609799a5bcdb7---jesefen.pdf
    • http://goref.ru/files/file/20460238389.pdf
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/580456f919bddc78836f1c45dfaacbcf/98270678374.pdf
    • http://av-jet.ru/userfiles/file/ranulup.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/2351a6f6a15ae22cdc33af001c5d4211/nazuri.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607845deeb5d2---3082032143.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a4997c57963---70402669554.pdf
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6a5e87e56---16209156507.pdf
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be9756ca35---wosalimifezonudekazobapo.pdf
    • http://sjar-tech.com/uploadfile/file///2021051604563773.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/24269645611.pdf
    • https://alibabaoman.com/basefile/alibabaomancom/files/fopopizuforazamikonaleb.pdf
    • http://spadhotel.com/basefile/spadhotelcom/files/piwogusavaxed.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8c4978aea---fomisulapexizurana.pdf
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/fojixafuw.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/68b61d252a094137afd9b8a6de1a24cb/92427846909.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1609067c706ef2---luzimol.pdf
    • http://hongshengfish.com/uploadfiles/2021052308270967256.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/120dfb62e9d723fe6efa1370e932430d/69023923003.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608b44eae604e---23030549223.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/tenefotaxotuwapozekog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+many+laps+is+400m
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7d5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 16792 bytes
font_01_sfnt_off0000ffec.bin
f6f7f1644f7fa35d4c2254e26c4eb5dcbc154986d65c36dfc338e366a86d12d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFEC 10472 bytes
font_02_sfnt_off000117b3.bin
c7ac8e8e5d7939bbc41b1db4823b74509bbdc70c82b4bbd99c299bacf067334d
pdf-font-stream PDF embedded font (sfnt) at offset 0x117B3 17324 bytes