Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1e0620bf3b64d5…

MALICIOUS

PDF

103.5 KB Created: 2021-08-30 04:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 90facd8f0bb8171e8bec026f2dd48fd0 SHA-1: 5fb0919e2d1613525318b3e66b0cb0e1ce0996c2 SHA-256: ce1e0620bf3b64d586f37d2cbe04e4a074bc672b6061a12c1c9525d88e58e960
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these external links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9861

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 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://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_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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