Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b67d0ee680d3ba…

MALICIOUS

PDF

110.2 KB Created: 2021-06-27 02:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8d87cee1cce541f7ea692867fbc05ab7 SHA-1: ae65c7bf05aa179759d98de3a9dbcc1045324992 SHA-256: b2b67d0ee680d3ba76f4601adaf8a2910e1d740ee2c2ae2c2f06ddf77851eb7e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories. These links likely serve to obscure the true destination and potentially host or redirect to phishing or malware delivery sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://archism.ru/uplcv?utm_term=the+fairly+oddparents+channel+chasers+full+movie
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c1893130fa5---71108764594.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d40186cd5f0---42337921867.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210610065336198.pdf
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/7bfd9d32f8fb8ca45e1f3960bd720eb2/xelirabewefewava.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/5cc233cb67ad4411e2bbf4f90f99bcee/61769104440.pdf
    • http://relocationservicesgroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607275881dcd3---78867082195.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/7bghikbg7huhijaesj2qh7libc/vinabazugi.pdf
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760d76bd16f---bigidujosaw.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160707ac105757---95858938591.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a373978d1ae---badilugozagasewepa.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb56828b620---bigiwiwuk.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2560c31e67---lukisibutavetobosu.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608350a42ba29---juzukoxuko.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/2j5jfq0opfs4o76fkfh23gimg7/zugijomojubavuf.pdf
    • http://bjjiffy.com/upload/98472701924.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16088f092b2c3e---63155101802.pdf
    • https://mmagame.com/userfiles/file/77833633052.pdf
    • https://piuspvc.it/userfiles/file/94602781618.pdf
    • https://codecs.ro/images/file/nafakeriniso.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761373839ae---62660435585.pdf
    • http://gd-weimi.com/upfolder/e/files/20210626043322.pdf
    • http://glina-master.ru/admin/ckfinder/userfiles/files/3375603794.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc07d68d09d---82277734716.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_off00014729.bin
b259f02f666e6bef34f8fca38bcf8b6abcf2a93d86a74666a75fafd62f003363
pdf-font-stream PDF embedded font (sfnt) at offset 0x14729 18784 bytes
font_01_sfnt_off0001777e.bin
5553d0e2183b05618a65d2d339a4d1ae90b00453251f14afe76f4d00320c7f38
pdf-font-stream PDF embedded font (sfnt) at offset 0x1777E 11128 bytes
font_02_sfnt_off00019155.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x19155 16792 bytes