Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd137106a6dbbfb…

MALICIOUS

PDF

87.7 KB Created: 2021-08-16 14:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 43a630e891c12319b4a5658613f4cea1 SHA-1: 5e3d8b99d9db8b5a584ecd388f8b579acf5f50e4 SHA-256: bfd137106a6dbbfbb6a32ac9dd4fb5e3a5384c8004de79df69193ebaba0d258e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://medvor.ru/uplcv?utm_term=takeuchi+tb230+specifications PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/b4akjcp9iv8hh54tk3ld6cfe4t/67037616415.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea1611471a---50325665980.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/12212056317.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/15190318904.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/49707693029.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/26005365701.pdfIn PDF document text
    • http://huerural.com/uploads/image/files/wiwefofut.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/55360142281.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/pugemadurepasapisox.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/naridumifaratitabadidu.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/rawupumokoser.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/10352812551.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/fepazalabapawikedekox.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/tonebarixiriwixa.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/rtstp2e3grc5hol60gjdd76s83/3085965576.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160832affd4d10---rugojalogewuwaw.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861ddce06c4---tufuvime.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d79c001fc---jazotuzu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ecbd34c7b---98247873692.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a80da66dd83---penadesixaranaxolek.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/limaluwufuwodadej.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/48054428203.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/gavamibamazokuduzul.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/dazimezexiko.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/tejifagetunuverokezukekuv.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_off0000ed36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010548.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 17888 bytes
SHA-256: 36cc9268144738a01c5e9304805939e46c3233342d9abf35c7d7bb7fcd9fc403
font_02_sfnt_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 11140 bytes
SHA-256: 59e4e5fb8520c8e8139f202e48ae75da6e695dbd3430b5d97353a6341fb8f5e3

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