Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b90443876016a25…

MALICIOUS

PDF

70.2 KB Created: 2021-10-02 23:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 71444c788d028b281bdcfa1fcdd70d54 SHA-1: d30d7b38ab3fd8ccbb2239622d4f561046d2e5be SHA-256: 4b90443876016a25272b745b34c145340aa7a1256c34a98f85b0decbb1398eab
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://crysiq.ru/uplcv?utm_term=if+you+want+to+go+and+take+a+ride+with+me+lyrics PDF link annotation
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/e052c4cdbea17bdc4ba188477ad37733/10207054087.pdfIn PDF document text
    • http://parfumland.sk/upl/mirazedos.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/63758676967.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/98813617062.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/29431713866.pdfIn PDF document text
    • http://grandfiltr.com/files/file/82654338368.pdfIn PDF document text
    • http://3234.us/data/attachment/file/pogusebotutiruzadafuzobug.pdfIn PDF document text
    • http://poslovniimenik.net/firme_data/files/50025438825.pdfIn PDF document text
    • https://jotelek.hu/files/file/xiterovijemole.pdfIn PDF document text
    • https://lp-tracking.com/userfiles/file/luwikajefazakemegejil.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/52985861578.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/murovugemosovimibuno.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/94500666218.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/87309302308.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/95249159437.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/sijegavatat.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/enc6no5gd7q5r3fi80nelmmva7/vanidoxuvapedevuvaserirez.pdfIn PDF document text
    • https://kitapkaplama.com/upload/ckfinder/files/50346254019.pdfIn PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/6944729068.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/6808980237.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1614090509ddd6---28484690292.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/nowevifugupatulililofo.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/nabomonugadoziwapizesago.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_off0000b0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E2 11268 bytes
SHA-256: 4d9c6134266af9652c5c327c8cadfdc37c6d6c49938f3aa740092d3d87f830c5
font_02_sfnt_off0000e305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE305 15480 bytes
SHA-256: a3baa81fa9f6106f9e1eac61d6bd20114550bd1cf1b3f700f93fae3e77bd13a3