Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b50e0ed54dc5bd8…

MALICIOUS

PDF

115.2 KB Created: 2021-07-04 14:22:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 44d63f1581437574d33464f7b3535553 SHA-1: e1f6e6712b7831b6bd026682eed338a16c9c3bb4 SHA-256: 6b50e0ed54dc5bd866c8f4b018c712d25ad9b0c5a36242a64419d55daaa85aa5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external URIs, many of which point to compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristics suggest the primary function is to act as a link farm to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://irlanc.ru/uplcv?utm_term=median+income+clearwater+fl PDF link annotation
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf34536013---14979643384.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/935f7f26bd1b818423d9f2f9f3e35439/veparujodasixuwomimenox.pdfIn PDF document text
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/65707126845.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9639a9b6a---34906320868.pdfIn PDF document text
    • http://twothirdsmajority.us/clients/38522/File/dijafo.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/zulemiwo.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/6119324450.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/23472722799.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/guzasarirutavo.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd9fca3a50---35739763763.pdfIn PDF document text
    • http://koovappadyscb.com/ckfinder/userfiles/files/lomivamujetusuj.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/40408323887.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/vij8q00u8lbucfv4furutkrqml/xefikuwiwuzawuvubega.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/dodulimale.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16092ce35aa486---nowezekixevusikefikovisep.pdfIn PDF document text
    • https://arerp.kr/data/file///mumalisatatigomogoveziba.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba62f972348---39612295794.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210612_040659.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160c6009577d50---lejupekid.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/lorufotoweriwakavebapora.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/demekibuk.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5f1343c54---dewubotosuvuvezozuxakixen.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8d1dbc7ac---zasijaxutupixagewidol.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/vifalijegaxuxa.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_off00015ee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EE7 10548 bytes
SHA-256: e11c0fb6c02115ad2eb46496695d1eeecb91d4928c79c948773a60f5086ecd88
font_01_sfnt_off000176f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176F0 17836 bytes
SHA-256: 679e121ded83723fdfa7367e88e5727d2df5b827ac07c9a730b1470717a7810a
font_02_sfnt_off0001a627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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