Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4f25cb181a6c80…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 13:14:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6be277889e0f3bcfaef9d350da7c1f07 SHA-1: 5604afd2db6ee009d1a3f08ebc19e66ec2d515dd SHA-256: 8e4f25cb181a6c8021f0551b352bce290d3d75add1c1bc95ecf4c2fb3755845e
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves luring users to external sites via a link farm, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f8ed87f0---fokukubomebudewiga.pdf In PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/15846960027.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/161315958c338c---4478464643.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/23230848595.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/76606001403.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e80841dbf---32259483334.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161347aabd47c3---xoxirojiz.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/68924092825.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/23539027807.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/98261934654.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/lugaw.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/9102868873.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/68761264354.pdfIn PDF document text
    • http://giasuthanhdat.vn/Images_upload/files/xabunevavuvak.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/pitoza.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/patid.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/zogepa.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/18523182080.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/kirowaxovividifuxu.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/piviwogenesopas.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-12/20210912200659749664.pdfIn PDF document text
    • https://learningsolution.ca/userfiles/files/kuzijok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=bride+of+chucky+full+movie+online+freePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F5 16416 bytes
SHA-256: 0a7c40006fc27d51153b21d6a48ea79a8c7f146cc8b15030b343ea684e52a4c8
font_01_sfnt_off0000ecb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB0 10740 bytes
SHA-256: 7eeeed8fb9ae13b76bc620b8936c927b316485a5f3ec68f0619e49443f4a3019
font_02_sfnt_off00010526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10526 17836 bytes
SHA-256: 3f61a29c1fbd5ed7b774ac7e2b5d269826322df23eb5608bde69241f4d9183a6
font_03_sfnt_off000131d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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