Malicious PDF — malware analysis report

Static analysis result for SHA-256 58ad28697f1ea70a…

MALICIOUS

PDF

76.4 KB Created: 2021-08-27 23:46:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 57e3db574f9e46a32b9e216401ecbd50 SHA-1: 6e06de1f3a634571fbc9adb8bd7de5cff883666b SHA-256: 58ad28697f1ea70a6e516741b924d0e8dc1593eb363170b795f3a862312006b0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document's structure suggests it is a link farm hosted on compromised CMS uploads, likely intended to redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic indicates the document attempts to trick users into calling a phone number, a common tactic in phishing and tech-support scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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) 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://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/j27402ue3gp10noec1ss6t8l0m/15366603008.pdf In PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/48d0545337c768c1a44fe4861e312503/66257689746.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ec92a1a06733f227ce94f9fe67eb8933/39616063030.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/i11umo3rhtv8iiv1r8f8917j52/71122662473.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/85196ae09e65d63d9b94ece2ffacd148/49307893135.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/fulapuwusesug.pdfIn PDF document text
    • https://makiriaszto.hu/ckfinder/userfiles/files/33998824828.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aedc1bcf43---28587528107.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/55508468644.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/9d6f5d99e37223da4825b10ba7f8967b/2902449438.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fffd46d5eb7---wumix.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3a62f0fe2---nawuxibiweweworopojapulil.pdfIn PDF document text
    • https://fasaac.org/temp//files/20859908894.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/c5b834d40edb391737add24d5ebfceb0/kawavizenifoxudameg.pdfIn PDF document text
    • http://qqsbg.net/uploads/file/dutixoturifom.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/oqtqgtqqnf5aphqivdthnobcch/78185195368.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///55815200189.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c305e2604---71762159191.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/35462512099.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a87c8163ff---91499680009.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/jafofidofirojad.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/90639388286.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97d3a1a5bd---17731947640.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f7d6d70dc32---37089379772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=process+accounting+in+cost+accountingPDF 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

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_off0000ca84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA84 10460 bytes
SHA-256: 6298b74440041aa3dffe928df3477966804287d7d54b9402491f2044c20ebce7
font_01_sfnt_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA81 15720 bytes
SHA-256: d7ee9462e5269b9bb31103b1bc2c4b2c42564d76facbe6f394bd16f193c0dc56

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