Malicious PDF — malware analysis report

Static analysis result for SHA-256 44b018627c77995c…

MALICIOUS

PDF

81.2 KB Created: 2021-09-06 05:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b17233f12723ba533d480a8fdcedcef6 SHA-1: 4e92a20c258d0689138b6411c2425837b45a6ccd SHA-256: 44b018627c77995c3121d6dc25066676baa7a598c5f14283791ebf94f22928fa
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://postelezmasivu-zlin.cz/ckfinder/userfiles/files/vesanulavodafamenux.pdf In PDF document text
    • https://marigabung.com/contents//files/36576761602.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/jumawowenulomixoropuda.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd8d2984e16---lidetulubibumobadirin.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/32821417546.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/rizixalurizewolujunurul.pdfIn PDF document text
    • http://upakuika.com/img/file/gunusulisor.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/vojodijizuxovoxe.pdfIn PDF document text
    • http://leeandrewdavison.com/download/kibiz.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f6acf2d7790---62166577300.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/43974147557.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/surupamor.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/1jtmt6t4pd475kb2s6k4pu41m3/81062354766.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e414e0b50---sesuwaxifuloxowixetaxun.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/nifumizavufawusa.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/dotego.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/5b8fa69417885d209ff2cfe11486bfe8/62808825396.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/98257830902.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/nixoripozorikifedugunu.pdfIn PDF document text
    • https://ka-base.no/images_content/file/fibubabiwuluvuwikazus.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/fakalalebenigefanetij.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/5e56fe725384232ea405f1de7e8128d8/mipagawobijatipuloge.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=skimming+and+scanning+worksheet+ks2PDF 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_off0000d42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD42D 11144 bytes
SHA-256: 710d2966259ebe4df0f1906a1eb6a37d70e03638cf9067905b307abaa10fb5bc
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 18352 bytes
SHA-256: 803894ff75a76be33aaef95997bccdfb92d5b6610b9500ed89538bc8936e4c69
font_02_sfnt_off00011dae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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