Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e91c7e35cae3b6…

MALICIOUS

PDF

89.6 KB Created: 2021-06-28 06:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ab84b3831a2496d73866cba9a6638e1 SHA-1: b8091955ff97d78488a4aaac4f8d3fad296baab2 SHA-256: e0e91c7e35cae3b61d4070ebaf017b007b9d3f3088055fd13def128e2dd0c490
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple links on disposable hosting further supports a phishing or scamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d019d9843438188650d9db553966951a/riloguwewolar.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8cbb0e35e---72181991015.pdf
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/878e77ed199e687abd25a92cb391554c/zujivanizamir.pdf
    • http://cesishotel.lv/res/wysiwyg/file/76781159003.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/7c632cff76b7942290227e99884f4158/71134656867.pdf
    • http://botosani.ro/img/uploads/file/gagowurujijama.pdf
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/futigilemoxipuzarikajepug.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54ab15062---9671563811.pdf
    • http://engroupe.ca/aym_image/files/59102593054.pdf
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/9ac50137630194358a95bcb63fe7ed2b/xugefirezonajonavuzoduduk.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4b8d05f397---6117070492.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/29291da30105d5a5cbd6a480679f2168/67709602404.pdf
    • http://bisenzia.it/userfiles/files/65023527101.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2b78eac90---20640397272.pdf
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/tm0uq8e5n2ep1diuhrm66uma1c/23646262321.pdf
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/lirisutijuxedanebajiv.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/omh58p1iure0ddt4rp7ksr0lg7/wuxenajaromajedisevowigib.pdf
    • https://fundreamz.com/ckfinder/userfiles/files/sozar.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b526116d3d9---64952645853.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/e79e3f83ac27407d619c27d3474429be/javedilisonewogowofa.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160797d78d58a1---virazajizuvoxukexuwa.pdf
    • http://pk.mo/userfiles/file/motofetorofulemaba.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160825fceefafc---86431067427.pdf
    • https://deniz-sogutma.org/img/userfiles/file/nufadozezelejonorujetirif.pdf
    • https://zanhotel.ro/beficientconsultingFiles/file/91317742688.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=skimming+reading+examples
    • 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_off0000fad9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 16792 bytes
font_01_sfnt_off000112f0.bin
8c0e5582538698412c201b92a7fafb504c65acf9ad99000ac55bcd7f5ec4b879
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F0 10788 bytes
font_02_sfnt_off00012b79.bin
6330f9bb980c0fd692618d5e1d27587419b9d1b61fcc16221b19d64740f1141f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B79 17548 bytes