Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38afa5819d48faa…

MALICIOUS

PDF

116.9 KB Created: 2021-08-15 07:06:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8368a13eeec121559a653caf024cbdac SHA-1: 4498bbbb577b2dfe9d3206fd117623bd77f89a0d SHA-256: d38afa5819d48faa3bcd097e7cc3ec6b2f34444c9d082acf2e0018f7bc9f0606
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://vibangthuaphatlai.net/uploads/files/80810567851.pdf
    • https://clove7.com/userfiles/file/40677179985.pdf
    • http://studiocalderini.it/userfiles/files/nupabug.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/3e7272b2952625e3477f5aa71daff541/sonojevaminu.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6542c6ec---34265445507.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c30b1560773---55852277426.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/07560beacdf5eaf3d25b6356b6fd2afc/12633124060.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2b5fd2d277---4642426845.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/ahbs5731g8qg50msa0gjrgimr3/jufozisadevup.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4d64226e---mutefo.pdf
    • http://lateonsettay-sachs.org/userfiles/file/16415269153.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/b4da7bcf3e88946dd5715a16b8623080/25267239407.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c65943a0fa3---19068225302.pdf
    • http://suvagcentr.ru/userfiles/files/vuwiselamuvupap.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074200808da6---dagupegisanigigef.pdf
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff50f7188a---xibubuzujidefuzisefexaso.pdf
    • https://medtek.vn/storage/file/27983611707.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c6019f574---rigujijo.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/4hcpkg27lt20s4nvbcr108onn9/98531553128.pdf
    • http://www.ondebiz.com/userfiles//file/94987432408.pdf
    • http://sevennews.com.br/ckfinder/userfiles/files/puzemixetasavusopafuwew.pdf
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/kg34hs50kvgtajr10rnfqc6614/26846321007.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=yellowstone+season+2+episode+3+recap+vulture
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000163b4.bin
5c9318c616fcc8286509b76b6c91a6f56bfaeb1188661cf23a81856edb343998
pdf-font-stream PDF embedded font (sfnt) at offset 0x163B4 17988 bytes
font_01_sfnt_off0001926e.bin
9685c6168d8a98b98d8af0011beb13d754b827e84481019b26aec3d9ab3f4584
pdf-font-stream PDF embedded font (sfnt) at offset 0x1926E 11036 bytes
font_02_sfnt_off0001ac60.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC60 16792 bytes