Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f60a8b8fef130be…

MALICIOUS

PDF

86.4 KB Created: 2021-09-08 03:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47668ba99827b8278427f836321d7fdd SHA-1: b7c0f13ff731d3e0e228dbc357f5576623a1bc1b SHA-256: 2f60a8b8fef130befe04595ded83904711cb19a3ce5f1d5b69b971ebdff2aa1c
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document structure suggests it's designed to evade simple content analysis by acting as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://cructi.ru/uplcv?utm_term=short+stories+books+in+urdu+pdf PDF link annotation
    • https://digireg.es/upload/10192750892.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/zukewup.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/70849927906.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/fcd0ecedec15f4d81f8717a0307a0db2/6605165891.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/jikuwemesu.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/lumosoditanojuji.pdfIn PDF document text
    • https://museos.comarcadelasierradealbarracin.es/ckfinder/userfiles/files/puwiduxikesilum.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/bulijonemuxoruxofifus.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a0dbe47aa0f---virofejiwojesubutirasevob.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/68615783971.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/pujuwufatanosegalunub.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f410da924f---mebijorixele.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/senuwexogade.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/72252030728.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/sb14uavusd4ldg3bebhd0kcl41/58150696444.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d8df91124eac20778e1da52ec32fce1a/58976642428.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/28421063978.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/tidaz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c1d6e8c11---68997941962.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/2c865968bb5930696749ea8a82c7c804/11212747912.pdfIn PDF document text
    • http://10glazsikeyrosa.ru/file/notemezozi.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/57702084376.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a36a8b60ffe---kilopugabob.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160772532c810b---96872676613.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_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 17920 bytes
SHA-256: e2dc3f62e2fbe5e0b1d5301881adb9d4e79a2185561f8b30487590b3a200d861
font_01_sfnt_off00011b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001337a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337A 10792 bytes
SHA-256: e0dbc3d7db29131e4cfd62b95684ba30caa94a9845cd018ee885c11d9b1938d1

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