Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ab3d828d7829e2d…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 00:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7140df84e45af6c02d8b4640df8f77d7 SHA-1: 41d7ba939f4e79e60bf9d5ce9aae373569902573 SHA-256: 7ab3d828d7829e2dffe3a01c179d631612de35b8f4f262370e35d1fdaebe308d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It functions as a link farm, with numerous embedded URLs pointing to compromised websites, likely to host further malicious content or phishing pages. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports its role in distributing malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ol40eg0hfmeq3sg35odfkhdi2j/peloma.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/u28rccpjoi6f818ltpvdcq23nu/86352998788.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/d2nuqr1p01jknau56fh5rmfma0/9525130689.pdf
    • https://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/96bbe480adffcc24b7112261e30bb079/ranixekipapiruvav.pdf
    • http://willismctyeire.com/clients/c/cd/cd1fd5262213d36872a77bd42df049b7/File/rejofatamosovapos.pdf
    • http://boxethai38.com/upload/file/pusorupexixuwewulujiw.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a06c2c495a6---muneboniselijunaleri.pdf
    • http://blissworldbeauty.com/newerac2c/userfiles/file/86694371608.pdf
    • http://flexa.cz/docs/file/68288493254.pdf
    • https://roweryelectra.eu/app/webroot/uploads/file/16246368111361.pdf
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607649f1468ed---29805372047.pdf
    • http://szentimresiklos.hu/upload/file/getutaxogusugejoxe.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c24da455cad---11361776780.pdf
    • https://amadesafar.ir/basefile/amadesafarir/files/14769756330.pdf
    • http://afghansolar.com/userfiles/file/50806159982.pdf
    • http://myucmas.com/userfiles/file/94826530175.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/d536188f6a6a9094156a998452bc01eb/kolemapiwuxupibas.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5690b58898---63658156988.pdf
    • http://alnadaoil.com/userfiles/file/lolivo.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac9a5b7086---jukezumisopip.pdf
    • http://gaziogluenerji.com/images_upload/files/nujewirixupenuf.pdf
    • https://jxloanchien.com/style/postimage/file/70412326793.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160868cd74c77a---komijobamuzudenesugat.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606e9d01a140c---41777232107.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d6295cb2685---43834295144.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=honorary+degree+of+doctor+of+letters
    • 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_off0000f5d1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 16792 bytes
font_01_sfnt_off00010de3.bin
105a6ec54b5dce8cd9d0b26918866c8b024ae1e6c05962c56c3e5aebd2ccc98a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 17248 bytes
font_02_sfnt_off0001397a.bin
a85c3ed40587ad7b0ea49050942c1791b82ce67eeead28a32692ce0aa7200d13
pdf-font-stream PDF embedded font (sfnt) at offset 0x1397A 10664 bytes