Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c8bfd173000bb4d…

MALICIOUS

PDF

83.8 KB Created: 2021-08-19 02:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 78e8b175340892b0913d729dfc1c83e8 SHA-1: b761404318a693c76d147975c8f770b6367a5baf SHA-256: 4c8bfd173000bb4d93cddb1fcede9a0b78647f71383577ef1963e9f3b5f54f5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://drafthe.ru/uplcv?utm_term=what+is+an+example+of+negative+deviance PDF link annotation
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dd20e911d---puzugimadujarumodadapesa.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/lojamovezesatiwonexopamus.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/b8d87c305c02ba23254260671a9db072/2093852910.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/8rg5f7pauf6ov2dfej7d49uoi6/fezetozufoxesosetopunexug.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/74881825404.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/75778712147.pdfIn PDF document text
    • http://premsaktidal.in/userfiles/file/49963687428.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/lexuzomosuliwetas.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/06/file/202106281906203575.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0d60e33c93dd1f3e40f8f61e8246b04c/20273950513.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e130f927a0b---turivejobesuga.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/lorawogelekujoni.pdfIn PDF document text
    • http://masonhn.com/d/files/bojotidof.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083b652ce3b5---nigimibemigibixeviwozowem.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/88231243473.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/20e958b8495d89ab5bf90efb30e6b3b3/xivob.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78d215a54c---38121490496.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/15372143469.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/nuvabedaxexutu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/39599064120.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/defoligax.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b77980dbc---dejejaxajubij.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160986a828e515---zepopugosepe.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160800a5a89a32---fijabufelibixat.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/30837144335.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_off0000e28a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE28A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fa9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9C 17308 bytes
SHA-256: 9c5038322e7bc9d2779f026c0c5cb750a66a37a008421a5098ce4d8855caad18
font_02_sfnt_off00012796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 11128 bytes
SHA-256: df0f8f752f1cd1e3898924811dacae6220fc3f9ce67d56161fdcd3f99ff664ac

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