Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c91893e0c0e36b5…

MALICIOUS

PDF

81.4 KB Created: 2021-07-16 03:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69165d2986b9e8be437c25c8417df028 SHA-1: d7f9a7e6cf3fa461156fd9991d80c231796ab0c0 SHA-256: 0c91893e0c0e36b5c4c3a7ea95a0c4c906db467289ed74a1debc30adb3c440ae
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms and compromised CMS uploads suggests an attempt to obscure the final destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://cructi.ru/uplcv?utm_term=ark+extinction+loot+crate+locations
    • http://akcjonariusz.com/UserFiles/file/duwimimidesipegixirav.pdf
    • http://sugarfree-gelato.com/upload/file/31331556086.pdf
    • https://psystat.net/candyticket/uploads/page_images/files/83750790562.pdf
    • https://bbpartner.cz/userfiles/file/3463489141.pdf
    • http://rchs1964.com/clients/5/58/580abc73d3aac4ea3a2bdd7c75327783/File/wijaviwidomavapotuxun.pdf
    • http://benhvienlaptop.biz/userfiles/file/lekidogavemajiludidegivof.pdf
    • https://angkortaxiservice.com/userfiles/file/43856592325.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2646f89bed---3899476102.pdf
    • http://vds-construct.pl/userfiles/file/supeponolisasepeb.pdf
    • http://hysansam.com/fckeditor/userfiles/image/96883893134.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce2674f4a---sutajilojulog.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/2c992f84beba2c1e52891281eeefab45/niluganozovilidasufodo.pdf
    • http://a-kamen.com/userfiles/file/55373402300.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/o7sufk0mh2gof1ls4p488q7us7/xepobovalaxaz.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/79i8bhehrb0abourulkutln3qf/13960703105.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//45076024734.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/nasozutunutojoge.pdf
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/e140c6af88b85f438749507b838490ae/tixetorixotubukoragene.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1fda03376---ladogiroka.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c85498de562---sikijuzanupibitogatin.pdf
    • http://ytovietnam.net/ckfinder/userfiles/files/70000563669.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/f3r8la5mgip92itb88a174u2nc/terosejizor.pdf
    • http://baocaosudanang24h.com/uploads/image/files/96920527971.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/6986525334.pdf
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcd1d8d5f4---35276950540.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_off0000dd7a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 16792 bytes
font_01_sfnt_off0000f58c.bin
9b92144b95bda077766fd3adffb91e1859967259b4892a9178523e8f551048de
pdf-font-stream PDF embedded font (sfnt) at offset 0xF58C 16620 bytes
font_02_sfnt_off000120bf.bin
513e50ca5ed50382390adacca3b38afc32b9dbf09f52554771b487161f2e162a
pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 10396 bytes