Malicious PDF — malware analysis report

Static analysis result for SHA-256 750f7072642587d7…

MALICIOUS

PDF

83.2 KB Created: 2021-09-20 13:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4e914191779450e9b3c7146d68752a29 SHA-1: ab42e46f3747d409d904e74e3de710ddc3dd6c63 SHA-256: 750f7072642587d75499533841a2a52f79adf5b55f5e9175c3752aa559527863
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a link farm pointing to compromised CMS upload storage and a callback phishing lure suggests an attempt to deceive users into contacting malicious actors. While no scripts were extracted, the document's structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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.nbc.com.vn/ckfinder/userfiles/files/26742702380.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/77977713894.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/99300087678.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/filatutesidilunejigibas.pdfIn PDF document text
    • http://secretlove.ch/ckfinder/userfiles/files/34112263031.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/towosu.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/1485698153.pdfIn PDF document text
    • http://zeci.nl/im/image/35732109389.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/bawunomegufanobugo.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/fugexim.pdfIn PDF document text
    • http://king-ber.com/UploadFiles/file/20210907194709922.pdfIn PDF document text
    • http://dokumsuzgec.com/userfiles/files/48389934412.pdfIn PDF document text
    • http://ewtch.com/upload/files/nidetutawogajiwotixapa.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/wikasabaxenusarufe.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d226f34d9---jerowopubimuwareneruma.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/145c72afbdb70bb2014819d71c015353/27908227119.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/40755986876.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a054d92034---nibudepud.pdfIn PDF document text
    • https://aokman-drive.com/d/files/jinax.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4645128a6---76680699874.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/gogewopovubumubosexumu.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/vipumev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+open+private+instagram+accountPDF 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_off0000dece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 18756 bytes
SHA-256: 5bf28a6b17a523ec777b10fdd87a381b11cb3a18c554b94051becce20b0d9afb
font_02_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 10916 bytes
SHA-256: 876049f5b732ea087f1ebfcd92a341ae97d5416c6326aa437c0fe9a024525681

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