Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5703ea190d1750e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-07 05:45:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9a7d51cbfe8bbd55c9fa4cb7f3ff3bcf SHA-1: 3c6d3474cba413111746de2843a629896fb29986 SHA-256: a5703ea190d1750e45bfeca66e10e6c23d51225e0a45d8ad77bd0b8498612f0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs, many hosted on compromised WordPress sites, strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://baove24h.info/upload/files/4701329710.pdf In PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16115b9d34dc02---98546845584.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa34077c46---31110762743.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/8bf1fdc5d409c67a9cb13b3cc99353ef/79683009526.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/kozoragipimowasex.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcb8e68160---gemabosiwipujewezeso.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/54397533615.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710a146cb10---86983175416.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83029aba6---69210224190.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/5c36ebfeda8cdde942c7134414175c9b/jelukixu.pdfIn PDF document text
    • https://teddybestore.it/file/xenomefad.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/24dbd6ce3912648e6ce2aa02508de8ef/gimun.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c851a60efd4---busupaluvadaxigivalikeseg.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/072203177775.pdfIn PDF document text
    • http://axwelindia.com/uploads/96766265600.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160f360b3b8079---40309205314.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/67048514330.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/83503902001.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160b030a7926cb---42746015244.pdfIn PDF document text
    • http://leilehua76.com/clients/4/4d/4d80c013f15dbe3c797666a457780dca/File/peniritisanuzesagawevil.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/gadomorujetitawa.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/tesufaweru.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/68844279634.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085f8eeb4e3e---pipotivowonitefiwoleluwa.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/wifozozajiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=types+of+water+pumps+pdfPDF 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_off0000cf3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 10680 bytes
SHA-256: 730359d593b1edafe0b374ef506290f81837f72f8cfad59cd765869cdd0fe8e8
font_02_sfnt_off0000fffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 15928 bytes
SHA-256: d099a86a9854e404a2c119f0b829006f4fd4dcdcdb8faa2b20881f8b602fe71b

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