Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a72fff46ddd7e0a…

MALICIOUS

PDF

72.4 KB Created: 2021-09-27 18:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1defc4d372997c572b6174b54cbce32f SHA-1: ce08549e439acbc65b1cbb1bf6926633428852d1 SHA-256: 9a72fff46ddd7e0a79720678d2808925c23e11e75f5211eca71874745029670a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://drafthe.ru/uplcv?utm_term=publishing+android+app+to+play+store PDF link annotation
    • http://kimhoatra.vn/upload/fckimagesfile/virimigevesapizozop.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/jolikizijo.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/baderazavitu.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce286687f9a40871fac5fa854d19c6c9/fanomavupolibariluro.pdfIn PDF document text
    • http://srs-budapest.hu/uploads/files/3457577663.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/4136515660.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/24436484319.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/sudupavegit.pdfIn PDF document text
    • https://claudiodituri.it/uploads/11511474979.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/2484715729.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/70535964425.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/tujilubaxifidonazozi.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/juwevafiz.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/84212644600.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///ruzoxixekewor.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614adc2fed1b3---41947577854.pdfIn PDF document text
    • https://icbacademy.com/upload/files/lojojopotetedidesef.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/ruvusesotobegemozixu.pdfIn PDF document text
    • https://bloc-immo.com/images/29801910054.pdfIn PDF document text
    • http://bdsductri.com/upload/files/67087067151.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/xidofetupolidipukupu.pdfIn PDF document text
    • http://datacomsystems.cz/userfiles/file/fomafem.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404d7a081ca---tofajagubarib.pdfIn PDF document text
    • http://trevelsi.ru/ckfinder/userfiles/files/fenolivat.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/xufavew.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_off0000b2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F1 18536 bytes
SHA-256: 72d367dd8dc2515b37b4142d7c8640dd05ead4495c1073f9efcd0529842935bb
font_01_sfnt_off0000e29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 11024 bytes
SHA-256: 8172e134d86ba9a3fcdd85319c43a9e0847b6e13e4be6eed3f3535c9ac082a61