Malicious PDF — malware analysis report

Static analysis result for SHA-256 a402522e38bb2528…

MALICIOUS

PDF

77.4 KB Created: 2021-09-23 17:04:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 203f22bec4cacf92d7c3b7fccaac9f09 SHA-1: 2a3cb1fc25d9b2c3f91a2b20474364614e2fa7bd SHA-256: a402522e38bb2528c885988a67ae3ecd5427d8cd386df02cca5829a05e65bd06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://sfeerweter.nl/userfiles/files/10347617936.pdf In PDF document text
    • http://hoya-system.com/uploads/files/202109201800116082.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/61025183646.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/824464053.pdfIn PDF document text
    • https://jakspravnenapsa.cz/userfiles/file/96053019002.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/vovim.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/tirekokewemibererimubiz.pdfIn PDF document text
    • http://ebus.cn/up_file/file/jukatiseweroja.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/90241087668.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142e67a57096---41049394299.pdfIn PDF document text
    • http://vattuxaydunghl.com/userfiles/file/29377018969.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613792dbd6769---65643700164.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/5a5accaf0775f6a4c09d986517060f31/32395275204.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/42820767463.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16141095c8e02e---7274894491.pdfIn PDF document text
    • https://fcksa.com/ckfinder/userfiles/files/99354709315.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///xututem.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/29827882498.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614a13e37cd44---rinaze.pdfIn PDF document text
    • https://mayxaydunghoangphuc.com/userfiles/files/50979808181.pdfIn PDF document text
    • http://podwierzba.eu/ckfinder/userfiles/files/nuwapukifibalumevux.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16145b2fc85afc---33579990739.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/caf61c5bda3012ee961b693b2eb559a9/8533429001.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=bios+ps+vita+androidPDF 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_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 18848 bytes
SHA-256: 996085c00d5f887d1426420cbcf843e1f60d998bbbd33a755a01f8321c2187ec
font_02_sfnt_off000110e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E5 10324 bytes
SHA-256: 7699b8ae071c73e0b34abb7cd57c65cbda095dcbb64cc786f8300e8de395ce50

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