Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4505bd4ce7488c3…

MALICIOUS

PDF

85.5 KB Created: 2021-09-03 05:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f01df403322b12a66cdbde81eee4cc25 SHA-1: 5fab8da47718ebecc82ec03f1f31b409e91a7374 SHA-256: e4505bd4ce7488c3ec89a6af7b13a91405a92b7a452c30c5b850de0149ec247a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, 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 further context on the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://fructusartis.com/i/File/18485240761.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160739eaa00750---vikoru.pdf
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/manoxozolube.pdf
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/eq4uscnsi1ulpll68rbpm7cc39/winuvowesevalodokubaremo.pdf
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160903494911a9---20162989402.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcedce78c34---tosofotekudibukebapebetub.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ce0987abb07a13db52e0d0b496b639c8/duxofirevafil.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611733122f41c---kevaxekozatefipufati.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b81dcb0cf91---bawukomuwiralitutaru.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/05c3a18042e59e19d8dc778b9efe6bc0/1412061553.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794ffadb44a---43264265880.pdf
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/54717330091.pdf
    • http://bachova-terapia.sk/images/file/55897649411.pdf
    • http://freewest.at/39366132540.pdf
    • http://orderleesushi.com/uploads/files/73540800574.pdf
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/f926f66d114662f5141fd54030cec07f/gevuwamuwixofufel.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/ot6k8jfp21hhigeanf340g082n/tidoz.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa155c7cb8---85314289372.pdf
    • http://fatamorgana.fr/uploads/assets/file/kumavobomesedazabafo.pdf
    • https://limpiezasinasel.com/userfiles/files/kabojubif.pdf
    • http://manninareunion2012.com/clients/0/03/03b30fdf9aaeeba733afadbef254ff7b/File/20763042379.pdf
    • http://drukarnia-warszawa.pl/pliki/file/dusokimojokovo.pdf
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f2963928515b4d4a62fc92a01d100b2a/sumekobavalomofosisa.pdf
    • https://leganordavigliana.it/uploads/file/lakimapajubugula.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=black+and+decker+cordless+hedge+trimmer+18v+manual
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607871249f146---5165216740.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_off0000e607.bin
885c6bb8ccd467a425de905d6fbbb44bd656a594b0a769aea9fd1bd13d0dc3ca
pdf-font-stream PDF embedded font (sfnt) at offset 0xE607 18164 bytes
font_01_sfnt_off000114f8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 16792 bytes
font_02_sfnt_off00012d0f.bin
8d9850b6075930044c8d429b0d6d32bd5061bfebbdfb17cb4744a0acf8b720eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 11388 bytes