Malicious PDF — malware analysis report

Static analysis result for SHA-256 268ce0756aa1aca7…

MALICIOUS

PDF

82.5 KB Created: 2021-09-01 06:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 072439a5e8ade415b43cbf52acb3ad43 SHA-1: 348f304100f298a9fc14ca60f925d7f841dadb6c SHA-256: 268ce0756aa1aca7603def1bfcd1410df0a36587f3b9f0d7150f140460e695ea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://queure.ru/uplcv?utm_term=harry+potter+4+the+goblet+of+fire PDF link annotation
    • http://rotarycochinharbour.org/ci/userfiles/files/jaduzidowogubajuxo.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082480474fdc---marajudisigobipovijokofa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cb72de7a3a04c2279398cf1f9ba81cc3/kavupovejixeretuluvido.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16089b2ca9b163---temisak.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/getepabilikawaz.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/gamidekafuxiji.pdfIn PDF document text
    • http://www.itidharamshala.in/images/uploads/files/33909814478.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/duwugobejowoxiketalolu.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/b8dc940ea8e8cd065772610125037644/73135175079.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/pidimafeboluxelufobefagi.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/nudifosenozaduwu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acef868a283---vuvuxow.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/genokawatufolutikapos.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/b5ce0c6034be98973b50b93d75d38930/52806237700.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160803586ec9e4---64578721007.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/47617018358.pdfIn PDF document text
    • http://hanifeugur.com/image/files/80365309210.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/81755027740.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/pamij.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/15291199611.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/2559a34021440ab35215b974e7c1c5e2/vikobufotofofada.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/10124618752.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/e0a9dc5efa6ba2db92f023210ca50ecd/69457980646.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/mewazinulepamemavovon.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_off0000dd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD44 18076 bytes
SHA-256: 749d21f0671003831a24feda96e958a8d9237d6899a13962aa9beccb4a89db95
font_01_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 10688 bytes
SHA-256: 84061541457673d421f805a55b932ecbe5b459e46a133c7fd4b7491536b4f49b
font_02_sfnt_off00012467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12467 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1