Malicious PDF — malware analysis report

Static analysis result for SHA-256 e745903cd01043d0…

MALICIOUS

PDF

89.7 KB Created: 2021-07-06 23:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f8271067f66623abb6e620ef32aa8dd6 SHA-1: fffdce8eae0908e66284027bc8a142096890c888 SHA-256: e745903cd01043d02d54e021eeff153f6f3fe13e86f18ed4ce2b0116060ff5cb
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The structure suggests an attempt to lure users into clicking these links, which could lead to exploit execution or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16079c0191adb5---55750969612.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608114da5e1e8---59210619810.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbe460d876---6980009011.pdf
    • http://jonmechina.com/ckupload/files/41753304084.pdf
    • http://ekolojikweb.net/upld/userfiles/file/10197528415.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f433e52ce8---6611196294.pdf
    • https://editionsitaliques.com/userfiles/file/45562186057.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/411f5dea847150f1ba0e19ccd6ac1e02/84743351735.pdf
    • https://easy2ticket.com/upload/files/pigezabojikubu.pdf
    • http://pantryscan.com/123cars/imagefck/file/wemibexibenizumoworimen.pdf
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/edd9518c53ea0c558e27a8967b637a4e/wixezezinibu.pdf
    • https://musikkursus.dk/userfiles/file/6956427458.pdf
    • http://faxik.ru/ckfinder/userfiles/files/luwiju.pdf
    • http://www.niziointerior.pl/upload/file/zoditutogedumawog.pdf
    • https://karpzbeldowa.pl/uploads/userfiles/files/46746426968.pdf
    • https://patc.fr/imagesfile/lanoxudex.pdf
    • http://www.hussco-steel.com/husscofiles/files/wemuwawokozivejok.pdf
    • http://liebherr-tr.com/userfiles/file/lazuxatuvudaxel.pdf
    • http://szentistvanpatika.hu/upload/file/fuzikofutisekemofo.pdf
    • https://pypconsultores.mx/userfiles/file/miposiwonigavawisixilebo.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7abf824de---xivaga.pdf
    • http://ofipapel.org//ckfinder/userfiles/files/6393180341.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/2730dc653cf308475b8cdb047a70e550/palilifab.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606f687e3376c---83045675855.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00fd16cb85---92132022850.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=65+mm+to+cm
    • 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_off0000fb6d.bin
0db4db1c82595a3c02dda25ebfef1675f4962bba55ab28cc205952930d70f493
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6D 9792 bytes
font_01_sfnt_off000110ed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x110ED 16792 bytes
font_02_sfnt_off000128ff.bin
95a2711b459d6f29bed2af502971a00baae39b694c1e39726a8ac7007e32da0c
pdf-font-stream PDF embedded font (sfnt) at offset 0x128FF 19124 bytes