Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a221ad7cce16dcf…

MALICIOUS

PDF

87.1 KB Created: 2021-07-31 22:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 94ff4cf12d3d56eec02c63931023a587 SHA-1: e2dae323dd705f2f6f5467c3bac26968238c2d4e SHA-256: 5a221ad7cce16dcf26c9ce04e3bdca3d804dfedf8045ed8a2866b60a6401f557
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, potentially leading to further malicious content or phishing sites, and uses invoice/payment lures. The presence of embedded URLs suggests an attempt to redirect the user to external resources, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://stalmost.pl/userfiles/file/zanagolojifo.pdf In PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/kozikovafikudilajalemi.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/1b6bbbb8a27e8fe2c9c79d75fa3a3a69/29244326720.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/5200838171.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/jagolejumejolomamigisa.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/e8e948d2517b2ee538ad306502147e1d/botefija.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/rotezorixajanuk.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160740e0edc08d---zanuwuge.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/56493098539.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/sixekugiw.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/noxujosupifaza.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a113ef5f9de---nesebubimematusugebisoz.pdfIn PDF document text
    • https://inncredel.com/uploads/gijajijowevimeniwuwi.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/30970680329.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/3adec1a5f6b9fa5db57d96099acfdadc/20190433614.pdfIn PDF document text
    • http://alumnicollegedelunion.org/clients/76066/File/55751224375.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/1u3achd3nag86fla2g7u9ts0ik/98106093002.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6930063c4d---12728116123.pdfIn PDF document text
    • https://etadelloro.it/images/file/xotonulipibinuzupevuba.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/gumirijir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=debt+recovery+letter+template+ukPDF 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_off0000ed07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001051e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1051E 10684 bytes
SHA-256: 568a27666f3a161a69cc43d3b062361f661905ce4249b040860ece8da701732e
font_02_sfnt_off00011d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D82 18528 bytes
SHA-256: 9b13b4d20303882e8c9843e8f5440194304ecb161798373f80201bb18b570578

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