Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fa0bcfd18d67f8d…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 19:06:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e528cd034a464b5e0c89bee85b3dd13a SHA-1: 755b77ef57bb9c2cb7c153c83bedf12c85a56a1e SHA-256: 6fa0bcfd18d67f8d2dde898c67ba10bf7bdb961392291bc9c29839811c2bb649
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and embedded URLs strongly suggest an attempt to trick users into visiting these sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://krisoc.ru/uplcv?utm_term=nudos+monta%C3%B1a+pdf PDF link annotation
    • http://on-video.com/movies/movie_data/file/nivukegafuk.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ca81pjbf0orccf55qu8dgovof1/kuxosatafivokikivom.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ed31017e5---tabama.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/12316005655.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16096d9e66ba54---ropizekobumeloz.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/runemobobovereliruz.pdfIn PDF document text
    • https://magazinul-de-instalatii-sanitare.ro/app/webroot/files/userfiles/files/wizuwiwovawegovexamovo.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/9qn0nbsel7pjnahse15ersemva/pofukaxizofaniseropufeni.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/70049682402.pdfIn PDF document text
    • https://soccerauquebec.com/userfiles/file/bagomipa.pdfIn PDF document text
    • http://hbleg.com/admin/userfiles/files/gukozozepimepe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9f3815915945503d30994dd228f73083/57241091246.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/rubofanolor.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/c7e6dcp6hsdsbtb0jelcmo0v9h/gogemulusowofir.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/veram.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0a1c7c0cd---9819094546.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/o4u47s2kiigs25j74gskgk418t/nonironage.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/pumanabulekes.pdfIn PDF document text
    • http://hkacca.com/userfiles/4488747609.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/6dae5abe6833c9eb6088eef4a924ad94/zokukovawezuziporobuwuw.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608897a50afe1---venod.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/6cf366c770198365d2df565444fdeee8/24837242976.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_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 20120 bytes
SHA-256: 213a1360aab569d24d52566bdd446b20ab6b1c40151cd272e1fadc2360993397
font_01_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D7 10572 bytes
SHA-256: 95ea5f361e4740aa3e53f948559d943ec3e2a290bcd764f41de68a9998e612f7

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