Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1a14c5164178d6…

MALICIOUS

PDF

101.3 KB Created: 2021-07-01 22:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7f00f4848ed9c7897f18c9188bb450e2 SHA-1: 6ac379a364df41e470c09e157032717225075e16 SHA-256: be1a14c5164178d69137a0212593d01be533b32575a39e0df0a2de933ae1b393
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a link farm pointing to compromised WordPress upload storage, suggesting it's part of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic confirms the document's intent to trick users into calling a phone number, likely for financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 7

  • 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.
  • 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 http://akicgiyim.com/userfiles/file/7569628171.pdf In PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f8a321e99---kabonapilivuzedel.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a58fcc8dc---dovepopokixazanafuri.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/49581609382.pdfIn PDF document text
    • http://dges.in/userfiles/file/24831992840.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/64934175018.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fbc70479b4---debukipimenasipirobokegil.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/14517125903.pdfIn PDF document text
    • https://brod-plovdiv.com/images/xurebefufagupelekolep.pdfIn PDF document text
    • http://ondrejkocar.cz/img/file/zawunetitubajumutobovag.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/g5h8vkd2g1509b8bf1efarp6oq/16654742810.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/98b9a8fd8ebc99d31ecb6de1dc905ba4/zabemofixejaguligul.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/35704228535.pdfIn PDF document text
    • http://biirbeh.mn/images/content/file/15697097350.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078e78271eab---47665375830.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/44iog5vliplckmme9a3un90s0v/lodumofuzikakaz.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5dc41ce35---17209516711.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/3786654713.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/e3r092qt7egau1srq9cj8u0teg/51934329780.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c35562b6f2b---juxuratibijenubetilusi.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/6457735078.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/v368vrj4vk0sru1l1bsrjstguk/56347158213.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/f7p0hct75kkp9pjlkmtjokelp4/zibebatewiramirogogujaxu.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/17608532286.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/61635479425.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160bc56f527f67---totefonelulupibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=the+boomer+left+4+deadPDF 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_off00012c77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C77 16848 bytes
SHA-256: dbc1498e59fdeba7408e69f4f189b7f83b10934501a88bb0d0176e28d004c45f
font_01_sfnt_off00015846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001705d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1705D 10436 bytes
SHA-256: b2bd0d4760d1bc41003ff5eaecb7ef2057aac5192e1ecff7c336b0936516cb50