Malicious PDF — malware analysis report

Static analysis result for SHA-256 33aaa8265aeb015e…

MALICIOUS

PDF

98.0 KB Created: 2021-06-27 18:18:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8132f68121ca49715a7722e1ad83b574 SHA-1: 85552fd44d1b0a85638e77b799370598551aaf52 SHA-256: 33aaa8265aeb015ea2db67c3f9f6aca85baad0b292234e5645f1e2fd33cf7b8d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous external URIs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://wastran.ru/uplcv?utm_term=words+that+rhyme+with+exact
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/8699b7d840b82b1589dc8123fac0f040/fifuwajatatofavawiviburin.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607b794dd0d78---33455385755.pdf
    • http://casaatlantida.com/userfiles/file///25396804882.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/785f8352d7bded3a0b4def964c72aeea/96606234717.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2f4471d6---71490397266.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608292c0daf62---bamagaropum.pdf
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca2e72238b---kixutex.pdf
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070451fc917f---47563974377.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885ebe4ac74---pururaweladixav.pdf
    • https://oddluzanie.net/userfiles/file/29597577061.pdf
    • http://betaempire.com/uploads/userfiles/file/file/72894068704.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7ab96f8e3973ea0bc726c144eac519b8/mowunazadituwijunenapori.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/640aed5f4cad09114402e938bf6e49de/82608299939.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/3e1c50c3fb2c38ceed6c2a74ab69b583/tinesimudirefiwutegali.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/dc4e97b5427ff7f09ed50fb3426282bc/22030532494.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/8a2209823984af1966ffc1744e1abe1a/zuzonora.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f9238e336---25544591515.pdf
    • https://cesiedizioni.com/userfiles/file/56230698725.pdf
    • https://gastriklandsbf.se/UserFiles/files/9886459245.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/f3jik8s8k4n02d6d9rvj807gb2/zukenumemedoko.pdf
    • http://ilovegabal.net/fckeditor/_upload/file/22246334918.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085edfaa3212---zimatosowotikate.pdf
    • 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_off00011da1.bin
1038d78ec90685084c0694c2d37316faafccc1b9dafd2b1178368b049138f41c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA1 17244 bytes
font_01_sfnt_off00014a00.bin
40516bd09064d71d435080c83ee9c3a2b9b8002768dbfa5adc5db94b8c21948f
pdf-font-stream PDF embedded font (sfnt) at offset 0x14A00 10780 bytes
font_02_sfnt_off000162fc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x162FC 16792 bytes