Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d2ffcc0e757b7f…

MALICIOUS

PDF

83.1 KB Created: 2021-09-18 13:29:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 347fb7eec90a911dc1b145fd84978a6d SHA-1: 1e465debfdc50e850a58ebc1bc58e43846a75fc7 SHA-256: c8d2ffcc0e757b7fbd276058bd744323f6d3873ede336b11b9069acc872e4d7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the primary attack pattern involves luring users through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=copy+music+from+android+to+iphone PDF link annotation
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138ac27911e6---napuzex.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/70756162503.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/32169359110.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/94298233686.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614448399d607---remubabul.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109111633005767.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/84021450840.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/niletirutaxositenomif.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/35395057074.pdfIn PDF document text
    • http://traviet36.com/upload/files/65958221843.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/nekusozarupojejazepuruvu.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-16/20210916033410851075.pdfIn PDF document text
    • https://economiadecomunion.net/ckfinder/userfiles/files/fitatefixopipapemefabiji.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/bb44cf6fefd154bf5a8c6c1f184dd6bd/43615223230.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-7/20210907125616442720.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/57377863689.pdfIn PDF document text
    • http://naoshima-habitant.com/images/blog/file/bakifilememu.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/47efeef2771e2da19bc01e2c5970211e/72585432027.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/mijozalaxupolatu.pdfIn PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/62440706131.pdfIn PDF document text
    • http://strahyi.ru/images/file/11772617979.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/83768594615.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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 11084 bytes
SHA-256: 944198f613a9e8d56f49462410242d5e15d66ce96e60e6cacc7ce13ffc067ffb
font_01_sfnt_off0000f93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93E 17708 bytes
SHA-256: e1b96e919aba3fa67d3933a3090de4d58e8f32b3b5b7f8311f98dd1647ca71ce
font_02_sfnt_off000126a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1