Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f4ce6582e067f13…

MALICIOUS

PDF

103.6 KB Created: 2021-08-03 21:38:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7244eacf47063cdf1b87056eef551652 SHA-1: 138ef6e2d03dd0265ee9fb0b831087bbd7bb6bd8 SHA-256: 9f4ce6582e067f13317e464e189dd115567991164d0438748f4138b09e78101d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to phishing pages or download further malware. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://drafthe.ru/uplcv?utm_term=islamic+novels+in+urdu+pdf+free+download
    • http://diplomat2014.ru/ckfinder/userfiles/files/bexilidexur.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p5jarlcrojdr6sjqgeucicus62/176444146.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160866ab34fa3e---788439986.pdf
    • http://gpszone.hu/upload/userfiles/file/foxukalinujuwozupasutin.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/3ca32e9480473150c8421c7bf777be73/tinobakuwej.pdf
    • http://raczcsalad.hu/files/45112798149.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d632292e7ee---fajafu.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609c559b64b48---9555432671.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160722c6669eed---71238936239.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16250302538535.pdf
    • https://maintogelonline2.com/contents//files/tododarexone.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4f27ae045---kuxawoluzibavorulabito.pdf
    • https://hijaulumut.com/contents//files/25603234898.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608cacaaeef9b---mebolikusokado.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/v6c7o1hneesr8sg0mqfi2tvl8g/makafuxidupifasefu.pdf
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160704df772796---68312478156.pdf
    • http://bajajsports.com/userfiles/file/90410728415.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/a1108aeed7e66ebf123238c602fd2199/xakejuguwozomeb.pdf
    • http://morethancars.nl/uploads/edytor/file/70806947782.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pohnd9rq8pifa4bpsomfhhocb7/44753962452.pdf
    • http://www.tecnobor.com/ckfinder/userfiles/files/vopijojutiwejapon.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608461b2294e8---kenojoguwojujonefebad.pdf
    • https://mfdesign.hu/files/file/gazutogigadu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014ac3.bin
4cb0a6006093e2aa7c2fd19cd56ed6557ba6c4274e41c505bb799fb4dcb2bfab		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14AC3 24772 bytes
font_00_sfnt_off00010686.bin
f6a78a8a63c94dafceba3b48ea99971eb9019b295c7a9f3d1ac2a3b460f9f27e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10686 16968 bytes
font_01_sfnt_off000132b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B2 16792 bytes
font_03_sfnt_off000176f7.bin
5b775d2f4440a59bf76e2e0f07029d254c044c79bc1a3bf9fdcad15cc8055317		 pdf-font-stream PDF embedded font (sfnt) at offset 0x176F7 10884 bytes

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