Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7be4ca2f307dae0…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 23:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b16cb8b20d2ce4a916e7121433483e42 SHA-1: b3662130077467611f51fbc77022ce88c3ad22ce SHA-256: c7be4ca2f307dae0bd0dd7b0497eca0d05d2ba886770b5435c17d2d9b0f295e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple domains, including compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content. The presence of numerous external URIs and the nature of the hosting indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn----8sbnbd9chja.xn--p1ai/userfiles/file/26083565076.pdf In PDF document text
    • https://bloc-immo.com/images/jisik.pdfIn PDF document text
    • http://raczcsalad.hu/files/57287521657.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/28515380066.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/juwodibenekirabul.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/525eb9b9ab401dea37be9b4dc770a798/715758454.pdfIn PDF document text
    • http://padgettlawreunion.com/clients/79772/File/gidegex.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612079dd81401---9640712205.pdfIn PDF document text
    • https://cristalensi.com/public/File/97128929786.pdfIn PDF document text
    • http://parkhighclassof60.com/clients/871169/File/kajazenatigu.pdfIn PDF document text
    • http://biswasi.com/userfiles/files/34826340821.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e6ae10c50fc---14235994208.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/67586829445.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/e403f5916a0a0339fdaf1d6584883be5/tilojitozulewediwoxoxozi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e13ef907e6---24021220143.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/lizikutupaloduwiboz.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/vemetawalulotape.pdfIn PDF document text
    • http://www.moyekolodin.com/files/donomurazevitefumevubu.pdfIn PDF document text
    • https://cuatudongsaigon.vn/uploads/files/42518678584.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/88f5c7cc627a071e241fb4927a0f3299/xutosajor.pdfIn PDF document text
    • http://hjhchem.com/upload/files/kapowikeroje.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/19eed7bb502307c1b15c1d9aaf3bef4b/vavezaraxul.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/vofepesesomizixiteduzevo.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/lavajejugurix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=mi+band+4+manual+espa%C3%B1olPDF 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_off0000dd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD68 10872 bytes
SHA-256: 4885740ff03aa53aa77deef857de80ba8c580af8fd2f9e7983b0a550f41ccf07
font_01_sfnt_off0000f607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF607 20184 bytes
SHA-256: 799937e35b39d8bcc718795e051106041a0baaae0d25b6ccbd8ca4a8f659193f
font_02_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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