Malicious PDF — malware analysis report

Static analysis result for SHA-256 90738916b0f5c55b…

MALICIOUS

PDF

77.1 KB Created: 2021-09-27 19:36:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c427183fb039b814fefbea8503607d22 SHA-1: cc6418af722552ebc025680edbc94e9234eff877 SHA-256: 90738916b0f5c55b228065029e98827a7f19563d8473e4156567666885ec5f90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=persona+3+dancing+yukari PDF link annotation
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/54c690b55ef11842ceb87fe1236eb7c5/tifokisawukofarivipikawis.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/demudurozub.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/64042616102.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/vujumoxikajukerinozikane.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/8515309766.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/67871260818.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/siniwodivumegibededaw.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/38913822626.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25772057879.pdfIn PDF document text
    • http://cuanhuadanang.vn/uploads/image/files/gonosadodej.pdfIn PDF document text
    • http://fedime.org/imagenes/dikonapiritilenimamamakeb.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c273f3bb67---rodudukasom.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/rafufukegirolewosajesagux.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/delotadabemogajik.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210901104756.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/58038157328.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/161303b2111025---91885242856.pdfIn PDF document text
    • http://foodzipo.com/uploads/userfiles/files/juxakumekadubanapuzaval.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16150d00d7030b---11013424844.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491146afffe---51428049033.pdfIn PDF document text
    • http://colonia-hausmeister.de/uploads/files/87920139902.pdfIn PDF document text
    • http://wawabed.pl/uploads/userfiles/file/38240354188.pdfIn PDF document text
    • http://glttek.com/userfiles/file/tozuwagel.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_off0000be5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE5B 20636 bytes
SHA-256: 0ea62e260be4f2c1301aa791c83bdb16b8c935348a69c62015cb6c47f2f189c1
font_01_sfnt_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 10880 bytes
SHA-256: 28e1030e20025bc1f780687d9282abda767857c3acbd67b793f8ff6fee93f420
font_02_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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