Malicious PDF — malware analysis report

Static analysis result for SHA-256 a039ebad5eec3425…

MALICIOUS

PDF

81.2 KB Created: 2021-07-31 12:22:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 418b7349ec0a6cc8b60405db7f796f93 SHA-1: 869b524127b9db1177067df9c90f5f3e7f40d15d SHA-256: a039ebad5eec3425b636b979e430d41288b1e98c2bab4ec6b5dad335879e75b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress upload storage, suggesting it functions as a link farm to redirect users to potentially malicious sites. The PDF structure and the presence of multiple links point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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 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://laborke.ru/uplcv?utm_term=1995+suzuki+dr650+service+manual PDF link annotation
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608646377701b---69183630034.pdfIn PDF document text
    • http://avonsteel.com/UserFiles/file/92180899264.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/49783685007.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be93251cabd---1142425148.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a48e614b5e---vinofabarefok.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/ju39hatgv3pdh322akgb9kop2u/fotemopexulopebez.pdfIn PDF document text
    • http://faradtvandor.hu/picture/userfiles/file/193742520.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/femugagoluw.pdfIn PDF document text
    • https://baongochoa.com/upload/file/divebi.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/rvpvn7rol7krucvn8sqnk351h7/lelawetufonifigeridatafed.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/wigedulaxowugat.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/abbik66vdslfk6ac7p19250l9p/saxubiwasapalubikijolus.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092424a0ee6a---luribosigow.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608219e037eb0---mirodunamuvavizofitofupo.pdfIn PDF document text
    • http://zonweringnederland.com/ckfinder/userfiles/files/zepofunavuzik.pdfIn PDF document text
    • https://broodjedenbosch.nl/ckfinder/userfiles/files/tejusamodapetitenes.pdfIn PDF document text
    • http://tunglamgarden.com/images/fck/file/lifetadeva.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf641c1dd93---pokabuwisigopoxevesisid.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f1f27096a---91053073179.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/sfkqfkhgivpoo103f2gad21p10/jusaxobe.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/gagefawuxenizogodebawup.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/63997053672.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/40167470923.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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 17072 bytes
SHA-256: 03ce57b5d3dd0e8df67a732f3849d8e8a1b19e01d967d4de13c4a59a861c8af4
font_01_sfnt_off0001041e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 11176 bytes
SHA-256: 7e9adddbd9c8d57a3798c4ba72c3e42335be7cb0564caf269ad82950e842594f

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