Malicious PDF — malware analysis report

Static analysis result for SHA-256 29a93d18a5ce8c54…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 00:21:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfee5b58ea808ec002ed32c20d239073 SHA-1: b661607e14bf35dd454a6941850d5830005d7470 SHA-256: 29a93d18a5ce8c544bc1ba86d5992755a2acc2f59ff8262c6c5c6ceb7daf5070
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content. The presence of heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful resources. Although no scripts were explicitly extracted, the overall structure and link farm nature point towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://transcash.com/ci/userfiles/files/93783584266.pdf In PDF document text
    • http://bjqyms.com/filespath/files/20210903184231.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/49482207468.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/32385814551.pdfIn PDF document text
    • https://highrise.pl/file/bikigiwok.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/68261480891.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1d628ae1e---pisudow.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/ziluvudodev.pdfIn PDF document text
    • http://songdolandmarkcity.com/userfiles/file/21440136298.pdfIn PDF document text
    • https://strefaokazji.pl/uploaded/file/39551662975.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/zodoligaditufojig.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132e524d3294---90882971095.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/90585977043.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/13012953641.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/nilosipubixatol.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/87795070484.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/2911408176.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614262f87e426---87777668074.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/76341849935.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/jebipig.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/zovezojuzat.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/jexodawetudozebugij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=15+best+android+appsPDF 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_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 10568 bytes
SHA-256: b2311cca0e9894530145632eeaf482cc1dffbfdc0e36f3a4a05bbf03093ae1d4
font_01_sfnt_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF8 17496 bytes
SHA-256: 70dbcf12b9710f0c3681b9ddda1f56430acafd2d4c2816fef890ed8e50f75d24

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