Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f37a4acaf56a9de…

MALICIOUS

PDF

93.3 KB Created: 2021-09-08 08:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 69121fe9a00397e75bae97fbd3e65b0f SHA-1: 266302b850b3507cd422c156c0efd5871c2721be SHA-256: 9f37a4acaf56a9de611caa5d52c3cf83286dbd77ebbb11f1d420aa36d3dd0732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for its functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pixomot.ru/uplcv?utm_term=laporan+pendahuluan+kontraktur+pdf PDF link annotation
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/kanejewu.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/24237975957.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/0f18dfcc081a07c85256c469722920c6/44114001479.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/tifinutagusisifitekilalu.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/a56tr6nlvlkaemk864hpc7v0fr/72093009576.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/korudulexuxemajopa.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2edec2b05---topabamu.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/72843806271.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/t5t2vhf7c07fs09ieas0ofre5v/19514309172.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/74406223774.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/20303f57a550f549078073d27e941a73/fenakaximuwafodot.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606e7be16dd8a---61043982628.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e97e388f4976d71c4868a4108ecc2301/24693937030.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/tomamedopigajemad.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/xewazijexijakuwes.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835d38d6f3b---misejalukabixax.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/44436385786.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/xijij.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/zozobewajev.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/gabedifut.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/65896502819.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5f35fe1a14d9b8d431df730703280cc2/57553430904.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_off00010ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B2 16588 bytes
SHA-256: aab625ad7993a996ab39179ef5853cbf9ea2bdf5ace3de1ae1fe1e6f390b8c99
font_02_sfnt_off00014fe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FE3 10484 bytes
SHA-256: d6de05929e5786bd5310b8f2b68a750943ffa3d92831b3c9afc065b73cf04630

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