Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4cd302b3af69841…

MALICIOUS

PDF

72.1 KB Created: 2021-09-26 23:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 19e83f0d0d4a0f186c2b1a3ea5f4588b SHA-1: 29e1bc4ba1751dc3f5d966d951122a775c6e8b09 SHA-256: c4cd302b3af69841838aa3de2586742952e4a96dbe70d35afdd5a16625ffedeb
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links indicates an attempt to lure users to external resources, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://talleresjpg.es/img/file/siwamobamedoxugowoli.pdf In PDF document text
    • http://ets-sptk.ru/pic/file/22985407320.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/49789352163.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/5319474751.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/da92fe20903460a7db57e5fe4b0f342a/36572763762.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/82365014697.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/mozenokuwukebufuka.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/67531760804.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/96097709423.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/50719419253.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/43672623949.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/luwinawoba.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/46852197421.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/85855113377.pdfIn PDF document text
    • https://srilangkapools.com/contents/files/2360207731.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/517b52bff3cce8c5f310f8bc30e49041/saxiwig.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/wukigidamifasanexokikak.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/pagobilanuxitiz.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/vugisarexonoxefasiguxiri.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/26921612155.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/perepiletijubebetuker.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/63021862969.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/gafoxediwapirofiwitide.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139053caee7f---14174825541.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/98153132206.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+become+alpha+male+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_off0000b613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB613 17352 bytes
SHA-256: 42bf5a742a0c55fd0af6d1271f9ecef4d95c2d07bf4bafc70783d395973d9f84
font_01_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 10640 bytes
SHA-256: 07a9660901a8b59b2363ee0aff432d881651b90b09124901893952062f665804
font_02_sfnt_off0000fa5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1