Malicious PDF — malware analysis report

Static analysis result for SHA-256 6123c7ed904e0b3f…

MALICIOUS

PDF

99.8 KB Created: 2021-08-30 04:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5b4489213553c71fc42771e6bfeaa194 SHA-1: bc0532b8c02319f63172ecc9f0c568c7867aeb19 SHA-256: 6123c7ed904e0b3fd0cb8474ad184641da68f86e7c35bab4dc29ae413ceec7f9
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm and a potential phishing or malicious content delivery mechanism. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs point to compromised CMS uploads and disposable hosting, indicating an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7549

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://dkmmotor.com/files/userfiles/file/xixafiwazigaxivamom.pdf In PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2aada2dbe67ef273c9f247742ce88dbb/tarapebe.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160bd88b31a195---39523354444.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a396102c6e360d73a046340db8fbea44/nurevazazaxapiz.pdfIn PDF document text
    • http://jocoseatee.com/userfiles/files/78462893269.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/iolmr4p1aqg3r8n8mq17lr3k51/1116107210.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/ntv72l4ggubrs4qad5poqm0fpq/febozopusewogelimevorat.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/pejifudewonopuzeworulase.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/49040703037.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/54657384389.pdfIn PDF document text
    • http://zerosquareonline.com/file/47442114524.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/nopuvuwupaxun.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/c5tkb6o7de303sqhrladed8u28/xafulusematik.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160826a7ed38e6---42916164941.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/rexoduxanat.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef9db8301c---jejojinosa.pdfIn PDF document text
    • http://brlairport.com/images/file/18457045471.pdfIn PDF document text
    • http://praguetransfer.com/files/file/67048846850.pdfIn PDF document text
    • http://dh-cell.com/ckfinder/userfiles/files/30303376952.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f3599c591---35214526112.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/647c69e6de5f6c659473885e83a1fc3e/valufuvuxiso.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/43494520076.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/34737245613.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/17861654301.pdfIn PDF document text
    • http://dothi.info/images/files/56466443876.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/40105188524.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pte+tutorials+speaking+short+answer+questionsPDF link annotation
    • 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_off00012d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2E 19132 bytes
SHA-256: 53828b72b85162e9018eb89e0a2e5f80b713ce8089f5cd0c0f159f3cf73468c0
font_01_sfnt_off00015d70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D70 10956 bytes
SHA-256: 1771976c0d855a8a17b918b5d78b462f6b40e139efe7154d11174f8c56fc30ef
font_02_sfnt_off0001768c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1768C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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