Malicious PDF — malware analysis report

Static analysis result for SHA-256 a542145c0e21bf1b…

MALICIOUS

PDF

97.1 KB Created: 2021-06-25 15:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f198772a3f60c5e2a65449bc75f95b2 SHA-1: e69849f725c907e35aef99490afba27ce54ef1fd SHA-256: a542145c0e21bf1b3c05d328e6642319fdf588198b35519a8d39fce9817b9d68
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is likely a phishing or malware distribution lure. It contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting it functions as a link farm to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://alibabashipping.com/userfiles/file/pamonitimevetakaxu.pdf In PDF document text
    • https://pointvirgule.ca/upload/editor/file/nedawur.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/17316645499.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/e655689c26f895c6355fd07debae7e8c/sifegexepepixemiz.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b1241534b---fipijejijiwokidasop.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/ecf0b7563ebb425f80bd42ba9da9fb31/95639922025.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/760c087190f612373c715bcf95a4977c/torasuwadapimak.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/5547161cfa69e3b2e08b80f77db09f5b/ruvijiwo.pdfIn PDF document text
    • http://sillajen.com/fckeditor/_upload/file/39538106842.pdfIn PDF document text
    • https://capecoralliving.com/media/file/24985026850.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/bfa1c97914ae0fa077fe837d983a1bf4/tuwonupefikunigup.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/85713930993.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9ebccbac788f226625f60ca8463a1cef/81741896093.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/15889316689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=business+research+methods+zikmund+pdf+9thPDF 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_off000113c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDA 18092 bytes
SHA-256: 3433efa8b0fc11c08a410f5553d6d36231b9c86df9ea688049c7f94ab3da3353
font_02_sfnt_off00015b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B98 11312 bytes
SHA-256: e473ea4638f8f3a4bc686558f511b1552ea6a547033a8ab1787497bdc08d7181

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