Malicious PDF — malware analysis report

Static analysis result for SHA-256 79ed5b465fa9176f…

MALICIOUS

PDF

81.0 KB Created: 2021-07-08 10:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4fe1d05672a2c999cea1d878e9ace045 SHA-1: b298895a9c37b7c50fcfecc28ceb6ba59238ea3f SHA-256: 79ed5b465fa9176f61b6c94ab1564b638b2e65d1d9072aada75d7ea3f97693b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised websites, indicating a link farm designed to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://infrive.ru/uplcv?utm_term=a+bird%27s+eye+view+idiom+meaning PDF link annotation
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/663fc44eb3df5c6e7f7ce4ac42d51d2d/nolivag.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/a4533f3d73da60410944fa24c986fff4/fifibuzavuloxuje.pdfIn PDF document text
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/bdl3egsdl6kbtfjtk72v7infnb/pebuxil.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0fee27b7b---denixekapularavasanosenaz.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b390157f3f9---85781963110.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210629_CA20F029E229D752.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/67879815752.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/68752106112.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/91606863854.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/e29560ffa7b24627529184c00a2ebb9c/27245767550.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/69146221260.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/2228bc7066eab38c063a92ec8396bf3b/5090656817.pdfIn PDF document text
    • https://naoshima-habitant.com/18454736128.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/87895141561.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822d2b7118b---kevenedetolene.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/novuxozodutazodovudoweto.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/fikil.pdfIn PDF document text
    • http://poorclarescork.ie/images/lokorenedobesogura.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/46745250736.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3f78c1fd---25995715252.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_off0000d6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AA 18344 bytes
SHA-256: 1dbcaf2e54597801dc9fcfc2b9b71cf0c5c8d92291e6077954baa8264293b066
font_01_sfnt_off00010609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10609 10868 bytes
SHA-256: ebacb33e2b61f236e8ddd879d71c130bf85e031a055564e029f9fca259545f56
font_02_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1