Malicious PDF — malware analysis report

Static analysis result for SHA-256 789c955f9fbf3ce4…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 16:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ede30377f61b9f01a0e9df4a82a95275 SHA-1: bdddfeaa0c7811fb6c942272b2e40dfda21404a2 SHA-256: 789c955f9fbf3ce403ae69332cdef6fe788a5ff2de317fbb43a1bb9c00ce313c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable or compromised hosting suggests an attempt to obscure the true destination or leverage SEO tactics for distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf6c64fb84---kemigopulere.pdf In PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/ranivekoduwafawibes.pdfIn PDF document text
    • https://digireg.es/upload/ziwosamuxofa.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/gelalipitezirixatawadomaj.pdfIn PDF document text
    • http://jedzenie365.pl/ckfinder/userfiles/files/tovafo.pdfIn PDF document text
    • https://movingalpsfoundation.ch/userfiles/file/44733800255.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/98737959152.pdfIn PDF document text
    • http://dobrasekacka.cz/userfiles/file/52649458773.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/jirudatakevijixiko.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/nopitenafuwusewotirajepaz.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/62496716720.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/babis.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/9d9d510201c37fc6875aa117f0b891df/kejetugevepotafawofu.pdfIn PDF document text
    • http://siamsnail.com/media/userfiles/files/voban.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16134219e68f0f---10567534856.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/takadirolagudurolake.pdfIn PDF document text
    • http://budropol.de/Upload/file/jufasoxer.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/pujelelonigoje.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/gotezatusebu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3a23ebc4e---muzerifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=automapa+za+darmo+pe%C5%82na+wersja+na+androidaPDF link annotation
    • 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_off0000d4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D5 10932 bytes
SHA-256: c439d121cad646606d4c42f3d227a78d28dfeef53c9829fc9c6f9a4ab4e5b231
font_01_sfnt_off0000ee41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE41 18372 bytes
SHA-256: 8076f02f31b585d652213126667cddaa68d09fc152257a5531ef330f67d53150
font_02_sfnt_off00011c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1