Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cc945386b63d49…

MALICIOUS

PDF

95.5 KB Created: 2021-07-31 01:10:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5f7626997676aa3e57ad0d7aabaca68f SHA-1: 6a2214cfc2a6fe6af529f52f609ed10985e0c7c4 SHA-256: 51cc945386b63d49b2c5a16b968a8aa8a9a9bc3aefc68befa57981f4cf19cc3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, some hosted on disposable domains. The PDF structure and the nature of the linked URLs suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://orderbestwings.com/uploads/files/wanuzoveretijorabazo.pdf In PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/3733e889adbd9585df116e251c7da013/49122517502.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/70623290855.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/tujefa.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/19568827477.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/koxizuwu.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160731c811598f---kofalosibonafozupixede.pdfIn PDF document text
    • http://soepcentrale-dekeyser.be/userfiles/file/kikodabobibi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/kaxekizetajovixotunepa.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16070206796c25---13357285549.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/3310515196.pdfIn PDF document text
    • http://amandamaitland.com/images/file/6203212740.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55b16b8e0---jemefivisev.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/dijasem.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/24p6r3ijthreon7rrv8oi1hh96/pajupudejobibaba.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/1590be14d283a50d1f1ddfd62e1c37c5/36695466241.pdfIn PDF document text
    • http://446888.top/userfiles/file/zezabufasigevovus.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/vevijogetagipupotenavuz.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16095cbcd3bdce---kemasonapobafidedipalel.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/59515344349.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/pexunoduvemisibe.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jmc2mb7ftjgc0jqftk7j4t8dh1/togefaxurujaw.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/lekigogejigaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+place+ap+human+geographyPDF 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_off00010db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB1 17696 bytes
SHA-256: 4107b31fb7815cc59497b6521db69155491f0c59019341dff614d67ba46f0528
font_01_sfnt_off00013c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15461 11028 bytes
SHA-256: 6259b83830f6d8094bbc9bedab8107a8544292bced137c7183a4264dbef7131c

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