Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbecdfe9e9aec868…

MALICIOUS

PDF

68.1 KB Created: 2021-09-11 18:43:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5ec95d1e1594103d7a9ebe6b570dab01 SHA-1: 0f20b06bc5aaa8aed325979f2c91c5a867d1d5dc SHA-256: cbecdfe9e9aec868e16c8143800056a39dcb4823103338d8a7e04f77f9e6f2d7
176 Risk Score

Malware Insights

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

The PDF is identified as malicious by ML classifiers and ClamAV, and heuristics indicate it's an image-only lure designed to trick users. It contains a large number of external links, many pointing to disposable hosting or compromised CMS uploads, suggesting a phishing or malware distribution campaign. The embedded URLs are likely intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://thuocnam.xyz/images/files/7537835307.pdf In PDF document text
    • http://a-kamen.com/userfiles/file/fiwesowolerotevebul.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/vuzotefazuwag.pdfIn PDF document text
    • https://hamasataccessories.com/userfiles/files/gilirimexavo.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/bekidelap.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/91023795273.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a2de1fe9c---feziditurotofare.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/79364263219.pdfIn PDF document text
    • http://pk.mo/userfiles/file/sefove.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/12088717311.pdfIn PDF document text
    • https://777mto.org/contents/files/modazovevurijomidideg.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/metobobujuwikukaxomena.pdfIn PDF document text
    • https://eastmangroup.org/ckfinder/userfiles/files/84427333281.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/70081618556.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/57450650641.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/robadow.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/73667444189.pdfIn PDF document text
    • https://blugarden.eu/file/ropisasu.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vhgb39libd8rb1a82ptih247s4/jumizoxaluxokasikitogorek.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16138f85c7b200---13614125741.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/xapenojepew.pdfIn PDF document text
    • http://horizonpestservices.com/userfile/zivakubebatalikabaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=apk+for+android+downloadPDF 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_off0000b069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB069 10252 bytes
SHA-256: 2a55d48014c463e3047dbbe4302cf8547376abb48250227d0bbb14fdaa99a34b
font_01_sfnt_off0000c78d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78D 14064 bytes
SHA-256: 80c4097d5c09553090cf31b933ac04df3983e4b89cc0f8edba5c9122fb9a4cc7
font_02_sfnt_off0000ea84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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