Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7a5ad0346fff0ab…

MALICIOUS

PDF

89.2 KB Created: 2021-09-15 17:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 303484173e48ca5d3a35c54be6fb7f04 SHA-1: d624a6ad47d293ef8c3d53f0914ccab84c4b0c37 SHA-256: f7a5ad0346fff0ab52485d6086dac4c3b737eca2d1e641969f6da838fa4e740c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like nature. It functions as a link farm, containing numerous URLs pointing to external sites, some of which are hosted on compromised CMS upload directories. The document body is unreadable, but the heuristic firings strongly suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://posetili.ru/userfiles/file/fagaxisowugexakebujafa.pdf In PDF document text
    • http://marcobernini.it/userfiles/files/nubuj.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/0c2d2f8f0c3844ed2bd6f4d5a474f246/zetuvalo.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/xuxavas.pdfIn PDF document text
    • http://ruresept.ru/files/file/96475723821.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/xubokulekim.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e53f96578---nudakurexikudofizepemut.pdfIn PDF document text
    • http://ctnphrae.com/ckfinder/userfiles/files/vosufatadadomasolusak.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/17568456412.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163084023528754285851.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/1911593275.pdfIn PDF document text
    • http://embody.box8websites.com/ckfinder/userfiles/files/14718792981.pdfIn PDF document text
    • https://hiperaktivite.info/userfiles/files/kinexirapaguxevodibubape.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/basudufexolefusijelo.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/3063430597.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/43711119300.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/pufip.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/loxopi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f085bb69d0---39128959586.pdfIn PDF document text
    • http://iltorg.ru/upload/file/xelasubinukagajuti.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/14703184595.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/livowatesap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=sentences+expressing+possibilityPDF 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_off0000f573.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF573 10816 bytes
SHA-256: e1f7ee4528c3cb77de6c960735760f87ba1ada0a26ebcf66559a480dd6423da4
font_01_sfnt_off00010e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12664 18852 bytes
SHA-256: 294640f1518ba87a95ddf2562ca62fdf5bd3c605bbce13a37e156e684550a30a