Malicious PDF — malware analysis report

Static analysis result for SHA-256 f80c6fa9c433d804…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 23:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3948171a9dc0aa18f55e8c26941c0504 SHA-1: 29fe8e3fa6a1914a3cac8c43033a9866ac1b759e SHA-256: f80c6fa9c433d804dd314cbcfae689f5dde3b4df9b7bf0639309d57b1fce0eea
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://bandai-k.com/userfiles/file/wozovivimoladenovewux.pdf In PDF document text
    • http://tranindo.com/Uploads/userfiles/files/nuwojavalabekoduke.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/pifadafelasigobujexixu.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/fujubasuzazatemudu.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/17233476910.pdfIn PDF document text
    • http://aerotechgroup.ru/img/outer/files/98576296420.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/3064134155.pdfIn PDF document text
    • https://webmakler.org/userfiles/file/24876235087.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/susofib.pdfIn PDF document text
    • http://citysoupsbellevue.com/uploads/files/bejanixipozopiliveguvu.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/balifilowazeji.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/30640572123.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/eb982sems553jm4bbnvo621q28/93257960455.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/2688131079.pdfIn PDF document text
    • http://chinalabware.es/d/files/81869720594.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f87ffb99f4---69595807723.pdfIn PDF document text
    • http://hzaidele.com/images/upload/File/77056242890.pdfIn PDF document text
    • http://ellev.fr/upload/files/laroledibekigofumujunabo.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/28023883384.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/roxetizilifiluk.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea46fa514a---soxarusujabagibixulas.pdfIn PDF document text
    • https://chptravel.ir/data/file/tilowutanumedo.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/peleginij.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/eb7610bea61e0d80d21353fbf8ad727b/kibomi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=message+reminder+androidPDF link annotation
    • 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_off0000d5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E3 19720 bytes
SHA-256: c286f3f2453fd2b8b5aa0a80c02928977423630ba3db64c098b56611447b863a
font_01_sfnt_off0001099b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B2 10440 bytes
SHA-256: b709b8fedfae833084cbb7850a78fed19ae44d4c3da7e4293ef75054b24c4c22