Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c13adbc1a0973ec…

MALICIOUS

PDF

84.9 KB Created: 2021-08-29 15:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: dd1077f752fe26f5cd5af4159cffcf55 SHA-1: 1aad363d82998c5b0a775a3612502489c53b5007 SHA-256: 8c13adbc1a0973ec442fe9ffa5c11fcc3f01451599e7661007c92c6cbdefc6a7
176 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 and a callback phishing lure, directing users to potentially compromised WordPress upload storage. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a social engineering attempt to trick users into contacting a fraudulent support number for financial gain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

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://archism.ru/uplcv?utm_term=universal+protection+service+lp PDF link annotation
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f62545de5---4805538061.pdfIn PDF document text
    • http://jenistudio.com/upload/FCK/file/difesagapefir.pdfIn PDF document text
    • http://studiophotosfashion.it/userfiles/files/mineromizepupesomadum.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/a40e02ede8748305a58503b17df9d7cb/93356786832.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/83648761408.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/lawupadaxezililofev.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/595f7c57a1f9bef6d330319d2e55615c/rafuxijomenivekiduwemug.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/kasusazu.pdfIn PDF document text
    • http://bruningfoundation.com/clients/9/99/99acc79c432c4c389b364f5b25189af3/File/94072251460.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/dizovuriludeza.pdfIn PDF document text
    • https://nirmalujjwal.com/public/ckfinder/userfiles/files/68398211642.pdfIn PDF document text
    • http://summithighschool1958.com/clients/71652/File/roluvifefonalilapudojut.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/2e7637cc563c6d8d444623b8424a7e9f/30533427083.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/28446722849.pdfIn PDF document text
    • https://ljlconst.com/admin/images/file/kotuweniguxo.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/92177968811.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/55216190354.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/81305858887.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/09a8e025f4acafa9bdb538a25d6807aa/60817323406.pdfIn PDF document text
    • https://banghenails.com/upload/file/pozivemonusububazija.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/s38ntr4l99470ndf46ld60c1i4/88810140422.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/506074bf234b5749ffc27016bb5b535c/75927464624.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/tapalunubivadoveruvageg.pdfIn PDF document text
    • http://ghgunclub.com/clients/f/f3/f3036db30fa8ed97f94f648fc77c1040/File/10119122056.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16091428f74ace---16278848606.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/871jkc9092v0665l9meaktk8q4/wunaporikevoruleta.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607794b0a104d---18649192665.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_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C6 17432 bytes
SHA-256: c6416407da9ea84d2d658c25caf3146e764d6754cf5c8bedf9c1fdceaf547d0e
font_02_sfnt_off00012d97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D97 10440 bytes
SHA-256: 6f475bb28f3a2dde2a61596ff61e39f9320bb162bbc08eb8c65cfcb6cc19ebf3

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