Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ac50414c1d1def…

MALICIOUS

PDF

92.2 KB Created: 2021-09-04 17:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 21329d9abc13da06c43642d7a712b5f5 SHA-1: 35fe40962d2db478ad3f44416a0683bf3d50760f SHA-256: d0ac50414c1d1def6602a12794d57213cf2e1f01b69d67f360f085eaac16b8f4
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://agentcctv.com/userfiles/file/nimanetewo.pdf In PDF document text
    • http://wpscrm.in/uploaded_files/userfiles/files/12342417121.pdfIn PDF document text
    • http://palletgoanloi.com/img-dn/files/fobisoxedamevatufow.pdfIn PDF document text
    • http://petersonhigh.com/clients/33446/File/doniwunewovulod.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/60586279142.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d249624236---megijekogomazekafo.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899b423e0bc---97142618313.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/2a8437ae44930fe6801cf12d289be580/82222850633.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/e900877e44910db2ef024428ac19f7c0/4752153071.pdfIn PDF document text
    • https://fuoriscena.eu/file/77773459447.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bba247ed0---sibutumepa.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b159190a3---51553864368.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/0643ivkh6lqkvfrrdehqnq48cn/xilimogijigoxukuvugexuk.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/fbed08a714e6d036a1f366093942f7d9/gozamefunowipuminav.pdfIn PDF document text
    • https://csodamalom.hu/files/files/goradojalev.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/fe80be2481cadec988ac59c88bbcd0cc/lasak.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/4e56g3f09r9lfbf0ek2go637pj/77577042910.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/45522cd7b7a4736289ab4ecb075f1338/guvegumebasexitowujo.pdfIn PDF document text
    • https://digireg.it/upload/levowirenotomipakufubori.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/9g1erltgl85vsqu8od7l7l3832/jelawojozata.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/98647267254.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/bcudocitf9lkf648ib7s16qckv/7217374444.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e905c9eef38---zumujejub.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab900792d4f8b4c6adb1745c10352f20/48871325074.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=treasure+island+read+pdfPDF 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_off00010666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10666 10336 bytes
SHA-256: fc771462165094c3cffc7a46c6033812123e02c8d7455b759117333d58420f23
font_01_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 17600 bytes
SHA-256: f064cb240113ad93f0968a6e23646997387caeb92fb66a84dd617b9905af9450
font_02_sfnt_off00014b7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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