Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c7e8d745d5a640f…

MALICIOUS

PDF

92.7 KB Created: 2021-08-25 18:24:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fc863da66642b2b74d67a37311238d43 SHA-1: 6755bc76eca114c1c9ca1e55e23f7147ca7e09ce SHA-256: 3c7e8d745d5a640fcd388a3b66f7b67417b86bb9282c9eff9e0e1c4b0194f88e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://btegypt.com/file/39673298621.pdf
    • http://gayaarchi.com/userfiles/file/20210618124621.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089b36f431ab---99058375498.pdf
    • http://bjallstar.com/upload/file/76605716203.pdf
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7802bc954---53159550197.pdf
    • http://www.ecostroyservis.ru/File/31363766431.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8035fe74d7---83473506113.pdf
    • http://clinicaveterinariaalbese.eu/userfiles/files/woxijepefexebigigibopama.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a44667da466---16356730464.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bab451ac8f6---bazigoxukib.pdf
    • http://hosungtour.net/FileData/ckfinder/files/20210618_90AD17991F3CAFF1.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7bad7d6c0fcccf84cfb461a98cb82fe1/31358019582.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa247b482e---48543973748.pdf
    • http://artospace.com/pics/file/dusikuwifi.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaa57710c---mugotofamuzi.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160d01a3ed6ccc---werubuxifavudadovox.pdf
    • http://jar-ted.pl/file/waxedamotoluviruwepi.pdf
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/dc95d6b7ae4e5ffadafaf3fc58087e7e/49099621135.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/a0172caf2918e87e9396ec99f0f6baee/45808491275.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16103c4a1e6bb6---83208797328.pdf
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/53137091283.pdf
    • http://projecthouse.bg/uploads/CKfinder/files/wibixoxuw.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e323ac5ee1---22195810123.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/pmsb8kmp2esi1rdm74r7cgvqt9/vevotibolajumitujeliromap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=meaning+of+triumphantly+in+english
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000ecfd.bin
2345de666d72f832c563d23c16af8b66c67d884ef486bb0ea3756f1824a40f57
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xECFD 27556 bytes
font_00_sfnt_off0000d394.bin
5914d4144bca689064d75a352e225cc6133878ae919c070969bcd114c49a268d
pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 11012 bytes
font_02_sfnt_off00011e70.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 16792 bytes
font_03_sfnt_off00013682.bin
c202dbfd7fbf949a88edef2b768b78a7f9a49fe9145803793f998e6bda03ec90
pdf-font-stream PDF embedded font (sfnt) at offset 0x13682 17596 bytes