Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb0dd7bdefed4ea0…

MALICIOUS

PDF

85.8 KB Created: 2021-09-07 04:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c5d323a2b88b304507bbe839a6666b80 SHA-1: c482f6b780d59613ad3e1bee50fc7fde5315d422 SHA-256: eb0dd7bdefed4ea0315ea489cc810e3ae57d3a553088a5d80f901e894e0598b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=political+tribes+book+pdf PDF link annotation
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/2e4d3ea144b160349be4bfd6aee11864/55414545387.pdfIn PDF document text
    • https://photojet.bg/userfiles/file/83070472962.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/656907b5dce063a58e88063a4598cbe0/110278466.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/maviregusuxizogijosirikot.pdfIn PDF document text
    • https://gilbertems.com/videos/file/15465824390.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/b7b1a90fdcf60139368eb2524c1a26f1/nagolodijit.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800d15c409e---98739927951.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072e562ec91a---90441506528.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/58011165307.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/80125096244.pdfIn PDF document text
    • https://teamcode.net/upload/files/ziredazimosaliwexede.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715835498c7---gokorexodufuroz.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/75397953275.pdfIn PDF document text
    • https://kaisar168.com/contents//files/10066362107.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/ziluz.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/susabirapek.pdfIn PDF document text
    • http://haki.vn/uploads/files/nibiwuxuf.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/fibadan.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/zulozalafupi.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/331c02011b7511681227340c89d412cc/jawosevojufaf.pdfIn PDF document text
    • http://husplaza.hu/editor_up/lutekotaxiwivazuz.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/36639c14e1064f5aee2da8eb0742cd4a/94173640900.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/42033760627.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_off0000eb14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10326 17432 bytes
SHA-256: 54dab4e4a1f6cb649276d309409bb8384881fa3e54bda795a381b3f3b6f0a322
font_02_sfnt_off000130a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130A0 10740 bytes
SHA-256: b7f70d273b193d56a479102246f1abdef67567797d44688b45a1fbe4ef6df1f8

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