Malicious PDF — malware analysis report

Static analysis result for SHA-256 64671ce1f89e8c9a…

MALICIOUS

PDF

70.1 KB Created: 2021-06-22 18:50:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a84c5c07cc1e2155c00972f2a2414b59 SHA-1: 84a6f193b7e0efdb3c9c9781991e55f5d474bd94 SHA-256: 64671ce1f89e8c9a33d690de321ded8ad2075f588b9e591f8ad12ddc208555ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links pointing to compromised WordPress sites, disguised as a 'word to pdf converter'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content hosted on these compromised domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb9495344b---67510002017.pdf In PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ae9da61acf7---99880365058.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/gemomujuzatu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d03ee88d6c---97472394526.pdfIn PDF document text
    • https://klcmekatronik.com/ckfinder/userfiles/files/44388534259.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160869e87791a9---tevibaseluxogisot.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/68596955119.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/67129334161.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/kemozagulowikaxinox.pdfIn PDF document text
    • https://maturana.cl/upload/file/gefuxujuzuse.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af5935495---nelapikubopazebi.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076c0376a8bc---91496473356.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/a9b05feddbe4f5f7b8d862d3e9e318fe/81636553705.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=word+to+pdf+converter+large+filesPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c672.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC672 5184 bytes
SHA-256: 121958fc9e884c7bec7374b30d6d114ef431a519a01fe4659ccd108b1cda4485
font_01_sfnt_off0000d83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83A 10896 bytes
SHA-256: fa0ebcd41ee1c9e786e1d26092624086e9541eeaaac8bf7fe11c105034cff1f9
font_02_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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