Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cb17e7c4c81de7e…

MALICIOUS

PDF

83.0 KB Created: 2021-07-28 08:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 40994261e7f2cf78609a0b2a400c8593 SHA-1: 0cd31bbf54ad61fc6e0ab286bd3cea0a096c8dd1 SHA-256: 0cb17e7c4c81de7e6379b283a0fdc7fc6f545da97bfda7fcc21f28ae0dc1346e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, but the structure and URL patterns are consistent with a PDF used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/3c15d45b6918b244b1757a9431db77e0/15888200051.pdf In PDF document text
    • http://batiment-tunisie.com/userfiles/file/kipumemiwiguni.pdfIn PDF document text
    • https://tonitomov.com/picture/file/worax.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/48074405524.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/ef0ae573ac28cbedd91d862399f50b81/debezofovuwewuxek.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/46700931108.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160983fe31240b---ruberenirovufolomuguziw.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7b619802c---jesig.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160959cfd8bd3d---22971938590.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/57810983936.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/82045045412.pdfIn PDF document text
    • https://hagepoorter.be/files/files/38977226157.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d635b085e9---tofejepamarozajija.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cda3254a57---datimeratapafavaje.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160747a5f853b9---pokaveradebodagetoji.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a90cdc0642c---jawifukapuru.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ad75178b5---62938931512.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb0180477c---jukosisaporelabalulevosop.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6840c53b23fe82df7822c4be98acf10d/depetufaxipopuz.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/16520951318.pdfIn PDF document text
    • https://baxsporthorses.nl/userfiles/file/80617198678.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/f43cc8829cce51499604cdd7dcf8459d/nisuju.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0e85b5b4---12314663783.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=why+is+my+samsung+printer+printing+blank+pagesPDF 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_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF954 11016 bytes
SHA-256: 076bb586e5e7adec28043b0d5f09183d14d86fd68470de0282c638342e8b5dbb
font_02_sfnt_off00011287.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11287 16584 bytes
SHA-256: 83cd07729a5c88d71fe6a36e713fec0cab772525aebb164ef31ca74a1d8d9873

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