Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc5141a752cae5b…

MALICIOUS

PDF

76.4 KB Created: 2021-09-01 04:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9d592479378548dd299ac680ee375804 SHA-1: 50dcc39bb41352ec4e5e081574df86ecc8aec97d SHA-256: 1cc5141a752cae5b701c43c64b5019753fdf895f7135dff5bda409d8195d365a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the presence of these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=red+wine+out+of+jeans PDF link annotation
    • http://pincailight.com/zk/UploadFile/file/2021071322304273499.pdfIn PDF document text
    • https://kede.org/userfiles/file/79796791177.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210722201927_cjw234.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/15579522972.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5dbd735f73db564b8c299d2493a55d8a/31657257305.pdfIn PDF document text
    • https://artenika.pl/fck/file/46377908371.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/c630ad48962c805d639651d99e7170ec/45576975548.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/31467787830.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2b9a348907239f6d0771611e923e9209/wofuxorela.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/tadapugexezo.pdfIn PDF document text
    • https://advik.net/userfiles/file/xojubitegefebivusilinow.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/nedanalununavujitab.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/60361538300.pdfIn PDF document text
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/f0d1497317800352d03065fe849d9437/ziposujolo.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606c93ce77e2c---biloxumofadimupaxubedu.pdfIn PDF document text
    • http://kag.fr/userfiles/file/kabavolado.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5112d0c361---dofojumizumoru.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/48158675478.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/76509054275.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f3dd2bec2---kepasejukojewawakizimeju.pdfIn PDF document text
    • https://unaizahic.com/Files/files/roseriworesigaxelelu.pdfIn PDF document text
    • https://efnnma.org/files/file/xolupazisuxisadizobovuk.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/19532058131.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/db26c529fb6dc971b03f6e8717deedac/95915338524.pdfIn PDF document text
    • https://jobtiara.com/files/files/pikixezofo.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_off0000c810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC810 10560 bytes
SHA-256: 803d6f39e4338e1525d488ddcbc4da76d1e4281eebeb29b39110150bbf817b79
font_01_sfnt_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 16772 bytes
SHA-256: 7cee2ee7789cb2d1c7fd791c67223d586b66d075f071074b81a0a106231bac62
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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