Malicious PDF — malware analysis report

Static analysis result for SHA-256 c184ccaa81ce8253…

MALICIOUS

PDF

80.2 KB Created: 2021-06-26 01:11:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 05fcf1d82079d16099e8504d1b387571 SHA-1: 88c8d6fcd710830aae7f6aac9f54dddc47d4f68a SHA-256: c184ccaa81ce8253102ec0daa77bbe4f04c8a3e1e6f9aa1eb5ed995c24fe4468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=s+and+t+plating
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fa10ded5f---gixivek.pdf
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/mvrdbqa9kkbh9nqmqe41cgb70j/47876792984.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/rlmjnag82q50m1ifp1degh1ns7/lezidofobojutaxofa.pdf
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/i5pi3mkpqmfeq81ttkqhb9jvr3/xegukoraxanowafomipubisi.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/s7ih7ohrd41p866chahkc6qe45/miroraxuz.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afc0f6b7fec---4615520524.pdf
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/3bce0d1a2139bb4e2ff5553ba767079d/92239887842.pdf
    • http://inglewoodreunion.com/clients/68690/File/xufapimalosawavebolon.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/e15bfb4a36d4b48b93394f70995eba15/luzosinuzafanetefobo.pdf
    • https://emilline.dk/ckfinder/userfiles/files/82635356268.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/a0f4889fb040c24fb378503915c33afd/2940379787.pdf
    • http://hutergroup.de/userfiles/file/84312974648.pdf
    • http://i-daa-wl.de/userfiles/85396998465.pdf
    • http://apcmagon.com/userfiles/gixovatadifomidot.pdf
    • https://thinkhigh-tech.com/d/files/dorepepobufemixovodanix.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/448m57h7q62bf3l433acfomv96/903170425.pdf
    • https://africanresearchcenter.com/userfiles/file/winiwoxefe.pdf
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/a2752122ecf3508f7a301342969b1abb/wisetalinafo.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160a6550e737bf---7411312123.pdf
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e9b3ba903b1ffa3daad78ab69d9c1a87/78236717593.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/827ec09c118e3353c78fa179c642abe2/49916624852.pdf
    • http://szkolka-wiercioch.pl/files/file/peferezoxixow.pdf
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c069b1eebf---sijusaxigasani.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_off0000da41.bin
b6f74f7625dbdc3ba775612382bfec91702751d02a8b896812b0a556fb84a38b
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA41 10120 bytes
font_01_sfnt_off0000f0ad.bin
fe05c2debcc32e8c990e17269924027007c638982357b0c1c7d4dc587f37ba39
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AD 16552 bytes
font_02_sfnt_off00011bbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBD 16792 bytes