Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7ab0d0a93119e0c…

MALICIOUS

PDF

113.2 KB Created: 2021-09-04 08:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 900e116f58e91e49eb53f41d09381c77 SHA-1: f1866559dd47d5f301e4d20e59b2aaee9de11ce2 SHA-256: e7ab0d0a93119e0c186f353bd142631eead825a8372470a681b112d009597c9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to potentially compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. Although no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/c4169a1e59387c5ec0806eaf5ae12309/64031464538.pdf In PDF document text
    • http://zulassungsdienst4you.de/bilder/file/63137727048.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/06/10/file/20210610_023550_199.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/82125577002.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/55829318112.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1603944715611bc7c8a70f8.pdfIn PDF document text
    • https://cleartunemonitors.com/ckfinder/userfiles/files/delomowivoko.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/kimedawazujiguzubave.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076211462873---parugesawupagotimemape.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/cldrh53u1721m3ddvfgoeicb63/52992240668.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/58479630325.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/22004738219.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/goselipu.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/o5qhs569062i9f0r7tbreurjob/38816910040.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/364831000243010dceb60a7599bdbaa8/jepamosu.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/qs89fe08lqj2lr80u581b331hc/54892939687.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/53252504376.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/85711454131.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/403880024b7f20aac5c45e3f19c4a72f/nikorebebovuginovibufeta.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/wapuzipebojoz.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/bemoxafemazixasujepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=spss+statistics+a+practical+guide+version+22+pdfPDF 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_off0001520d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1520D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016a24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A24 11156 bytes
SHA-256: eae5792e09d705708c867df126006213bd1e174f3cc1605c4899ef2816982deb
font_02_sfnt_off00018432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18432 19556 bytes
SHA-256: 48611cdffdd5971ab01a002d71e9fb114b2fcf69431dfc3b610965e2b8531b77

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