Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7f37b549e320d3…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 00:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 88477aab8d92c5dc583f9c26f6463e39 SHA-1: 4c0560fefd109383e60abfcc526a573b175ea64d SHA-256: ac7f37b549e320d3f94bb41be2838562d80679030d4b0c950d2327904e9ba30d
156 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=acids+and+bases+practice+worksheet
    • http://inarchengineering.it/userfiles/files/tijula.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160d61a926b1c4---jixijolilobilubob.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b09c24433---sakirev.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f5a24eba5---levoz.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/j97kquvu5laumvq86rkijrsj8a/madetolivubuwuruje.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b88a28c9d1e---kuwiboviremazate.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fbfbb7e13---witidapumadufufojevaz.pdf
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/kusevubiralupameju.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/77183e6e53527323cd12d0cc20d4d011/40886220212.pdf
    • http://starrsgazette.com/admin/images/file/foxetuvixoliwafozuwopuwej.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/i8rne3jtsu33n6une8qidkn4fi/62331109564.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cc9319cd---58474725013.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ac18320a0d0---jedarejuregilor.pdf
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/v4gutnnfe4l5s9juacahimdfof/30230752421.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/36353473787.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/fffcba4e2f3a0e412bc6fe658b819864/zutapikelamoboxobukusexe.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de40aa2b8e---labirujoribo.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac05ff71fc1---mamexopubamexure.pdf
    • http://billsky.ee/files/file/51307023069.pdf
    • http://guchenes.com/d/files/jegovewozunuwati.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aab1e079647---22371790422.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/kowepedesidunimofegijapis.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3c65b8f46fcd7b60f50deebdf93ea85b/mobusoravar.pdf
    • https://anthonygillant.com/userfiles/file/91059849002.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e161055879---43907308310.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec58.bin
7fecce393a0b13d3bcc55ef80a1eaa58ddfa7b66373f51ab03f6406dc129add3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC58 10864 bytes
font_01_sfnt_off00010548.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10548 16792 bytes
font_02_sfnt_off00011d5a.bin
8c28db5d593a55082b71901ad793e099b1e7caf7433fc5a611143ade91b7513c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5A 16592 bytes

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