Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ceabcb4dd5f7ef7…

MALICIOUS

PDF

69.4 KB Created: 2021-06-16 13:31:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf04af170e52ae480c7e7146e3072734 SHA-1: 7388cf5762bda565754964626589931a07ca6e62 SHA-256: 8ceabcb4dd5f7ef72100af9eb2fabd27bfe65a2e30684a13044e022845f270e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=tiger+zinda+hai+mp3+ringtone
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/4743008574.pdf
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/879614b4aa98886f337793c40affe54e/xanemerewatevinor.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaa57710c---mugotofamuzi.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc3b3154f5---90654023575.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f80f184ff3---88737942772.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file/%5C/202105142218_866390718.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b386d3b1---2766637309.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f320782789482b3dc77a14a78ef316f4/boxezituzebazogiresaji.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9467243c31---xawelaxogubitimemi.pdf
    • https://butchercurnow.com/img/shop//contents/jikezeramevabig.pdf
    • https://invest.pl/userfiles/file/97430170693.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/796f655e8f48bbe5e45f8ef28950bbfa/88750493992.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/5993e20a57ad6f30d31c9c12a99e6215/kejisemew.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/3c7d8982716c041047151008de2e3ead/28407126896.pdf
    • http://webursitet.org/Files/file/wipikosip.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ada9ae7e145---56279442370.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090597c6e2c1---biluvokataw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2aa.bin
29d43219bb4f70e2e28ffd4b0f4802e13d1f40c9329e4e5911e47d01101f8532		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 5324 bytes
font_01_sfnt_off0000e4ab.bin
ba3d0f13d0033a619becde2a07694593aa622f24994516e846cb998c5887493c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 10664 bytes

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