Malicious PDF — malware analysis report

Static analysis result for SHA-256 5407f2b5956800d5…

MALICIOUS

PDF

94.3 KB Created: 2021-07-13 17:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2cc79ec8fb3153a0509cc2b9bd98b4de SHA-1: 5e147dbeca2987b8a9f594ffa96814ac8c3534ed SHA-256: 5407f2b5956800d57d09026b6b3ebb3069bcca4779ca5b9f19d03bf1e20ec205
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious content. The document body is unreadable, but the heuristic findings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=round+face+bridal+hairstyles PDF link annotation
    • http://hasyo.net/files/file/53924324460.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da2462ff39---8051459592.pdfIn PDF document text
    • http://studiodebiaggi.eu/userfiles/files/47738005647.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/piig9tfblpj1cpda8tu1neg6a1/39425444747.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/13600752732.pdfIn PDF document text
    • http://huiking.cn/uploads/file/041926155430.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9649b29f03---vebozekew.pdfIn PDF document text
    • http://51-lq.com/userfiles/file///60754987332.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/zudifa.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/23006884146.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/bfa9456580a03cd1bcd1213bcada7504/bowapokij.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/96512843094.pdfIn PDF document text
    • http://prosquash.by/data/16725446373.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad6626901b4---nojufofup.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b645ac46af0---sanizenaponevimetikinex.pdfIn PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/89296654442.pdfIn PDF document text
    • https://businesslife.com/content/file/58263727927.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/5mvja46okk2dficear7v9p9454/91068263366.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b49fcd5bf---6519008019.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/posobinumoxexofivevuwitad.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/60200211551.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/vomusupesoxaduzega.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202106292101026996.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_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 10972 bytes
SHA-256: 9a53c6e5a328b04df2a372f2393af47918ae4e80470729b3b00143b2d2a22a00
font_01_sfnt_off00012902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12902 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14114 16604 bytes
SHA-256: 3dc5771a436886c3419a53a473e304bd83a42acd0d232e30890b14c32048ba52

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