Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d7a940a49a34cd5…

MALICIOUS

PDF

96.7 KB Created: 2021-07-07 04:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8a608f326e86e85930e73c6ee23243b8 SHA-1: a8727457e3643592099ee058d5d4ff57c460a861 SHA-256: 3d7a940a49a34cd52a104abc81c00b7a296a01ca3090175f6bf4ba49832e8674
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a phishing or malware distribution lure, as indicated by multiple heuristics flagging it as a link farm pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure itself is designed to redirect users to external URLs, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://refpecsbelvaros.hu/kepek/files/71121117413.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/tasopusotopikulodefarije.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/ba7e21716e8d69d8fa8f86db36ff36b3/69577185362.pdf
    • https://aljazeerahpetroleum.ae/userfiles/files/liroj.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfdb2fef2d6---depidojonizimomopexapolev.pdf
    • https://securitegenerale.tn/userfiles/file/31328481132.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/f72327aa340d04c257de3dfce76ef944/2820471392.pdf
    • http://indago-rovigo.it/userfiles/files/zotoxorabulomowetegerora.pdf
    • https://adepotcustom.com/UploadFiles/file/20210507111606136.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3183b887f---33605873388.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c07a1d3839c---bituvajagatavuza.pdf
    • https://deniz-sogutma.org/img/userfiles/file/gajirerilimonogo.pdf
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bf06f502190---sizuwel.pdf
    • https://semangkabiji.com/contents//files/lusarej.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607509a75c849---togekigipa.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2739105cbd---44859487052.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d67b9af346d---86940453803.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/f73ak91t9n317mkqrr6m83fnis/laxotuvotoreromuw.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/4j94qhca1j6igi4k3p0e60b245/41432031845.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/3ba66dc9875d882613bee8aff78e095d/murugepagelefedajukuj.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a60c36aa637---83667134536.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/d039e90d2329c8e6bf8c9eddd9179272/dedokegole.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb88456812f---50961452981.pdf
    • http://ecohort.com/userfiles/files/49924641648.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=what+is+the+paschal+mystery
    • 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_off00011798.bin
afb41e36b5d0fb63234c370504f0ffa70586a1b81e4d8a36df7369e18b6c5a92
pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 18076 bytes
font_01_sfnt_off00014590.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14590 16792 bytes
font_02_sfnt_off00015da7.bin
21c1d4e908ae6839bf5b5948bda0259b2fac8be26e2f2253312e7f6a631d30be
pdf-font-stream PDF embedded font (sfnt) at offset 0x15DA7 10520 bytes