Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfa459d1580ab3a4…

MALICIOUS

PDF

84.1 KB Created: 2021-06-28 20:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 9592699128fdba0407f507fe403d595f SHA-1: 8363e5fa8a1bedc38c88ce1855a2a310b49945de SHA-256: cfa459d1580ab3a406c2471c9a089064d2984ff418be514426ff192ab044befa
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs and is flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. The 'SE_CALLBACK_LURE' heuristic specifically indicates a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number. The presence of numerous links to potentially compromised CMS upload directories further supports a malicious intent, possibly to host further stages of an attack or to distribute the malicious document itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://catamma.ru/uplcv?utm_term=meaning+of+venereologist PDF link annotation
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf10f2652---xiwaxugixeperigi.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/93205530642.pdfIn PDF document text
    • http://www.puhito.hu/uploads/26114587112.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/55245532230.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/qo7bnigvsun15mabrmigrucsq7/57066982379.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/75f683418bf5ce4f18d30f2e9c00502d/6307876582.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77c575a9d---jigonif.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1608abbffdc5c3---86739057534.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d57673c51a---87054822336.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4267c0a19b---17175156074.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/730de26ffe7e7fa020d2e661251af5b0/86427916344.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/54279322200.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/sisulidunazuruk.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/81142723585.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/63288156906.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/9tq7ro3arv8vfv0210p8if7dj5/jepun.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/gofifu.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/nexuposadux.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a3622a19850---12713874376.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5e3b4t7rq3djp91cm2oghidcs7/13108910569.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/jdq3i4kocpnkvlnhdptam08b8p/jesusofatojapavotilapawen.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/1337a83297fe78d8851b2b164d87fee0/muxifawefijeji.pdfIn PDF document text
    • http://www.climatisur.com/ckfinder/userfiles/files/8227898063.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 10448 bytes
SHA-256: 3039aafbc9548922de0a6b46ab5776ea5cc206cab479acdf3e0e77fad25a7971
font_01_sfnt_off0000fd6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 17220 bytes
SHA-256: 2f496147e6371247a0e38741cfc2ad8c00cdc940f10ff57cfd40b0a34b1155b5

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