Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdc05678a572cbd…

MALICIOUS

PDF

83.1 KB Created: 2021-09-19 08:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 055f1cdfc38132f7fe8b67afc745c34b SHA-1: 83111100a4440db75843d3b9d087a3590fc0364c SHA-256: efdc05678a572cbd6c379da0ef8043e31afadae2688003247ac21eadd0a3f2dc
156 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing the formcraft plugin for file uploads. These URLs likely serve as a link farm to redirect users to phishing or malware distribution sites.

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 https://huntic.ru/uplcv?utm_term=disable+automatic+wifi+connect+android
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143d9571d201---58085396995.pdf
    • http://aptekainternetowa.net/_mdm_apteki/file/pemewiketuvesiwafulapogig.pdf
    • https://gs-hemeringen.de/ablage/userfiles/files/kovelow.pdf
    • http://csc0451.com/userfiles/file/20210915225943_mdxn05.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614264c170201---subama.pdf
    • http://myxroad.net/upload/userfiles/file///fupedirokemene.pdf
    • http://opusbiz.kr/data/editor/file/83300229561454c5433b4a.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2c76ab98---42980829997.pdf
    • https://grafconsulting.pl/Upload/file/dedujunuximimowap.pdf
    • http://nhabe.com.vn/ckfinder/userfiles/files/zawetu.pdf
    • http://hkxhjfc.ltd/uploads/files/20210912050915.pdf
    • http://massageindex.nl/images/uploads/tujufasa.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/36616155213.pdf
    • http://cnc-soustruzeni.cz/files/file/joligax.pdf
    • http://chinazzjx.com/d/files/jusukefevowab.pdf
    • http://eca.or.th/ckfinder/userfiles/files/jexewipupilogu.pdf
    • http://studioguatta.it/userfiles/files/37238650505.pdf
    • http://apartmany.cucoriedka.sk/data/files/vogel.pdf
    • https://xenang-mitsubishi.com/fckupload/file/jedatipajadokovetanum.pdf
    • http://ks-system.co.uk/ckfinder/userfiles/files/15971884153.pdf
    • https://telliogluhukuk.com/userfiles/file/segojobefopig.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d658f2dec5---70212905828.pdf
    • https://ymvii.com/admin/upload/files/sakopezolesobodeko.pdf
    • http://konemara.hu/userfiles/file/xezibolozezuvebaleki.pdf
    • https://gionggiacam.gagiongvitgiong.com/ckfinder/userfiles/files/72047287458.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_off0000dd89.bin
c2fba9409595d50276a8eea40fdc58f45a151dcd56fedf84d2e62ef864a34b39
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD89 18268 bytes
font_01_sfnt_off00010c95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 16792 bytes
font_02_sfnt_off000124ac.bin
d5fd5dffdb0a251b1edddb20b9e83164c1b1bc9439aae57cf93e40b79003f5fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x124AC 10964 bytes