Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85e100707dd9e3f…

MALICIOUS

PDF

85.4 KB Created: 2021-06-28 07:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d86a5c4c703fec2306bf451b501439d4 SHA-1: 58d2f45a115f7a0fdccb85b4dcb78068f394a221 SHA-256: d85e100707dd9e3fb3fd86bbb68ae3c7cbb3a554bb260059e3dd217503f2fb96
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits multiple indicators of malicious activity, including a high number of links to potentially compromised or disposable domains, suggesting a link farm designed to obscure the final destination. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=woke+up+with+pins+and+needles+in+left+hand
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/39600701710.pdf
    • http://fairytaleweddingsandeventsbymary.com/clients/f/f2/f272f95a0afb65faa7304057ec0e56f6/File/90207758729.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/k4ga2a56fc9nd9724nchas4g57/wakefufamugolivabop.pdf
    • https://ph2020.org/FCKeditor/file/94620693651.pdf
    • http://ecohouse-lab.com/userfiles/file/wotijabilabajat.pdf
    • http://alpha-cp.com/userfiles/file/somanibugekukudovus.pdf
    • https://stijsr.com/userfiles/file/67148535585.pdf
    • https://kopari.hu/files/file/vifosurogisilibupakirux.pdf
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7ed729d7f2a118623b1460fda1fcef86/84686379317.pdf
    • http://ersatzmonitor.de/userfiles/file/69730712334.pdf
    • https://eobliecky.sk/userfiles/file/30403833891.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/e82f9acbcfa092758329bdc4955a1fff/45157553575.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/b54jfcoddlnrfm07pqo3ov7966/jolepoxibaxarumure.pdf
    • http://ya-ke.cn/admin/upload/detiwox.pdf
    • http://ebsenglish.net/_UploadFile/Images/file/lerilolu.pdf
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/c9eac676530d69ff3f1ef6a897e5cfd7/lamifi.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c64f95b3c76---16489859498.pdf
    • http://biomassasia.net/data_ed/userfiles/file/dixojevututejuxiwepawowaw.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3215c7bfc---zasivexopelozaxefuwifemiw.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/38c1049805371036c2d3aa645afb52bf/12632312443.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7477161dca---66756845356.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1c43d7177---87933429217.pdf
    • http://midel.me/userfiles/file/92991982469.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/8388a3b92d2579fe6b2d185910595b9c/lupigofugojezovanoruk.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5e.bin
fa2deae50e872c2907888a86b8fe5ea7f65cabfe3b6bb671bf63af4af4749ff4
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 16568 bytes
font_01_sfnt_off00011705.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11705 16792 bytes
font_02_sfnt_off00012f1c.bin
1749c1fcd352e7975c4388713fd5a36b4b95e6a2e65dfdaf97150dc2530cee56
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1C 10768 bytes