Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd442c455a46cc1c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-01 21:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bf881bc0f35fce086460a0d84ebebcb3 SHA-1: 0977c766a240df5a87bdab83a3876082bd784a41 SHA-256: fd442c455a46cc1c95a08dfc3d374dccc74fbd1fdf918748756c7315c78272be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=new+years+day+quotes PDF link annotation
    • http://medica-brno.com/files/mesifomalugezivo.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/90562560744.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097be88c6d1e---nikovupexevalugigekumajaw.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/liwelumisenusipojafoz.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa27273b02---33288032288.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754bd4195b0---73736776325.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/sj2hh4ode7ojf4afl1qoja86a1/zudemewuged.pdfIn PDF document text
    • http://www.grifin.sk/files/54015845656.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/xunezifume.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/97826267500.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/68c79f0e9a2330c4a96b2815a1edc997/sukasobefuxa.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/93194282893.pdfIn PDF document text
    • http://woodbridgeabw.com/uploads/files/nevegibubojuwimu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e7bb3ad10---68006169680.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/5ff2d373c068b2b1f918230f38888ff4/77956501818.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/kadosegal.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/75972584555.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae101b54263---fumimugumozitizuki.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/53444889603.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/36568299156.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/b1f2ac2afd190faa34787b6f3bad194a/34156581871.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/kogilolamivesevixaj.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/8910e79bfb449db6c697e1ba0420292f/56512371613.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_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 18204 bytes
SHA-256: c4d523634f1e574bbfe3b4e9670ecfa29dd534b5fda9875d28e3774031badf09
font_01_sfnt_off00011caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAF 10424 bytes
SHA-256: 6ed9322fb90a09efe0b7a178d983d001b652666d598d3120a1a8693756f60036
font_02_sfnt_off00013457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13457 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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