Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f003ab21f128361…

MALICIOUS

PDF

85.6 KB Created: 2021-07-03 12:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a79422a65625d02906ad55bda4c43b83 SHA-1: d06477df1a1510b0e4da09b60eafeab0bb642115 SHA-256: 2f003ab21f1283613e14527b9cbdbe5b4d05226ba7ab17b22e9d3dd20c12e6a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting. These links likely serve as redirects for phishing or malware delivery, aligning with the 'Spearphishing Attachment' technique. No scripts were extracted, but the presence of multiple external URIs suggests an attempt to lead the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=gujcet+paper+solution+2020 PDF link annotation
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/f938c586cc7e3b76cf7ea14e3ed53580/19801581307.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/tasagixalixodesalajexu.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/35936693070.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/d82bf179fcc416e4e55ab63b10e8011f/gaxepuwajesunarajagutomos.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609d99860b2f3---tofipopixumadula.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/fiwibezozuxafakubulezi.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/46972140419.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vkr15s2qdnmoee8e6q995f4qj5/gosapi.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d22602e83fd---55832536891.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c290b9d721c---vikatunibuwemujunukovofoj.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e40eebe601---89090067561.pdfIn PDF document text
    • http://sartor.ru/upload/files/tekeze.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9fd15703c64fe8d949d8aacd3f7c2885/60583011106.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/sixejorovovar.pdfIn PDF document text
    • http://woods-china.cn/ci2/userfiles/files/20210615235030.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/h1l6oo4frt8hfs6ms49h5b8727/somolemodagobubidebokazu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/6d8a414702f30afd3251c42846c4b8b0/dexidebemoboj.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16081212b0ea23---vuduxeted.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607306bb4ccda---98548813283.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/anrud5ukdhms5m2abdk59pn474/77622119236.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/9a3bd188163e0fd329998cf98d6c83b3/10002415934.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc352b4c17f---jitasigokafigugo.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/xevogitugeturibipizemi.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608116c5906a4---wosikomidofadameradepip.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16089f0f20dad9---xajakibavelilufur.pdfIn PDF document text
    • 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_off0000e8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8EB 10880 bytes
SHA-256: b2384b9357e120502ead775c3d042a06a4902110374eaf784d193a01c00d1178
font_01_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 17840 bytes
SHA-256: ca59dce43402eed85b87f41b181cf1285c15a13c340dfdb78ed6b3ebc280c9ad
font_02_sfnt_off000130fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1