Malicious PDF — malware analysis report

Static analysis result for SHA-256 471ce53b8ec67f1f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 02:34:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 807a1b2d8a1d705b2996e619d323fc8f SHA-1: 7219b90911fdce6b9e7cce121cfd36dde4ee5d3b SHA-256: 471ce53b8ec67f1f26b0a8a4a0194110f930f17abdd94de8dc03e1eab0469751
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing infrastructure. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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) 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://medvor.ru/uplcv?utm_term=configurar+apn+tigo+paraguay PDF link annotation
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614220874cca8---diwokezekevisibuwiv.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/gumakabiveb.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/kulalovubiwamaxirarirak.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/74383208989.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/54370511249.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/tilemomedi.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/80677210140.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/samosalesariguzuresed.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/fesamafuwexosirolazo.pdfIn PDF document text
    • https://servicepapik.ro/files/60014296863.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16143638d62e13---sevilivorubejunafim.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210912184456_59hgbj.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f840663dc---lufopasadedusaduwejim.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/xewirokupopogexi.pdfIn PDF document text
    • http://toitureetfacade.fr/data/Files/48683854176.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/sinumopevatobotijotojul.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/1087854697.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/9fec4ae29f10844ade44ac83f2abe0cd/49073107309.pdfIn PDF document text
    • http://saeronbio.com/userData/board/file/tomokafanawofa.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/6ca9iqbd88t606kpu8ji05mdf6/daxukugotakuxame.pdfIn PDF document text
    • http://itagqatar.zajeltel.com/itag/file/files/rakewodatitomofiwipij.pdfIn PDF document text
    • https://topupdana.com/contents/files/68668542262.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0cc3c8b6e---gomeg.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/lajifonemebek.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/zegisudojemuvalegutizujip.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/2c0a16953cd00a90a947e82f279ed0f4/pavex.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_off0000d88a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09C 18692 bytes
SHA-256: 9518c1ff441327a35e2a6fd34d0eb2d77cb701db8588484573fd5eb77307cba9
font_02_sfnt_off000120fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FC 10432 bytes
SHA-256: 853d89252f12a598f0b3d497598d4ee5369a6296ef5eccbb9cbd9bbfb0c1f718

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