Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcd5ed27e2a6221…

MALICIOUS

PDF

109.3 KB Created: 2021-09-12 13:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 560b2772fdb6f1e8c0118e0fcf502adb SHA-1: d4a2e685d899d392f7b42491a5c511bf64adb304 SHA-256: bdcd5ed27e2a62219ba418b1469e2dbe6344d602e32d9fb710362e349c897b8c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a pattern of attempting to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://inwebjor.ru/uplcv?utm_term=wpf+unleashed+pdf PDF link annotation
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613682daccefc---rabujuvuzikuxev.pdfIn PDF document text
    • http://nataliashishkina.com/userfiles/file/89419939277.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/wulitunidupegetezewowido.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/68273653926.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/goromadetik.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/80483398047.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/94147035612.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e99c28ae77---pevamomazelekefonoxat.pdfIn PDF document text
    • http://rubensova16.cz/files/file/29721567548.pdfIn PDF document text
    • http://tw-tms.com/uploadpic/xw/files/watevilafom.pdfIn PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/remigusekunexenij.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/2eb429c2059cbf1358eb513870a83089/xusoragulas.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/79531154113.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/161303beac1486---sumemuzo.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/99739927003.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/kagupanexuwugofumononop.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/24395212024.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613495940fd7d---kugetan.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/74102236990.pdfIn PDF document text
    • http://antitumor.org/filespath/files/20210909055924.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d028953e20---supogosotad.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/wurugowagetitevira.pdfIn PDF document text
    • https://tsegypt.com/file/morokoparafemazanot.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/wipibe.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_off000146b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EC6 18896 bytes
SHA-256: 08f9c4de6b21f00416c0524d4c0a6697a40173ed97bfe5d742b61738bde4346e
font_02_sfnt_off00018fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FE6 10276 bytes
SHA-256: cf05ea6c4da9b011fda310b68879f526addfc5bbd1fdd8eafb35c3353da1f2cf

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