Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6a754950d3f9e21…

MALICIOUS

PDF

69.9 KB Created: 2021-09-28 14:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a4f5c1e3139e08682cefa1ae3241b56c SHA-1: 3c164a603469002a59fb1e213e0cc318ac9d772d SHA-256: e6a754950d3f9e21467de27ffb6a4fb0ef3f1ab245e69fa22fd9607b827f8d15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://medvor.ru/uplcv?utm_term=what+is+screenshot+on+mobile+phone PDF link annotation
    • https://bunyaminerdemir.com/resimler/files/10661504034.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161368cc99bbf2---zuzizavanapowogodezak.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/57171180591.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/nobiseradobuzi.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/72200325722.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffbc0379ef---33430638686.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/23874396872.pdfIn PDF document text
    • http://hrudolf.com/userfiles/79673004013.pdfIn PDF document text
    • http://leeandrewdavison.com/download/gojusutes.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/86795501520.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/54d6c5rku99jsf2q867a86u4o3/13492237113.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/90189807301.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/80ee9cn53oniu418hajtqinarn/navasilarexinizapoz.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a68ed4eda2f8eccd53eabc9736b522ba/limarakujiwufezabagipeb.pdfIn PDF document text
    • https://intersat.lv/files/file/9896320822.pdfIn PDF document text
    • https://unosms.us/userfiles/file/61748739415.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/xosazadebe.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/97059021242.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/1044136242.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/39470191026.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a49c1a67ac---vanalowidironijo.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_off0000aeb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB2 10772 bytes
SHA-256: f4df0dd598b8a0a2037f1986a1549e387d528b7ab0f810ac5551233260eae5f5
font_01_sfnt_off0000c714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC714 16132 bytes
SHA-256: d200ed210f47407c23878af870c5d865519d14240245db33eebe1c5eef113968
font_02_sfnt_off0000f0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1