Malicious PDF — malware analysis report

Static analysis result for SHA-256 eceb7ce5bcc588b2…

MALICIOUS

PDF

84.9 KB Created: 2021-07-22 19:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5817b596a097d2acc85337b5d2e64d65 SHA-1: 6af059ad956dfa8e8d49180f8745be2362b99228 SHA-256: eceb7ce5bcc588b256ee998059a78278b18694216d185860feb79db5d5240c47
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous PDF files hosted on various domains, some of which appear to be compromised WordPress sites. The presence of these links suggests an attempt to distribute malicious content or redirect users to phishing sites, likely disguised as a utility or converter.

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://ahkjt.com/upfile/file/11821292584.pdf
    • http://afgventuregroup.com/cfiles/file/234718262.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f2792af01d7---logaxukipi.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607841d4e5d4a---simejagixuwogorixisuxifid.pdf
    • http://www.emailposte.com/pictures/65685611089.pdf
    • http://szao-spb.ru/images/news/file/38380195982.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/744a6891f656a19cd8ee6dd870aca431/55581055719.pdf
    • https://ytdrive.com/CKEdit/upload/files/26396524263.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a861c1422fa---15970131225.pdf
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b57f9a9865---86439496898.pdf
    • http://www.awakohchang.com/image/upload/File/627073596.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/5uo9qlr9p96emq220oaij5dfa8/65249051547.pdf
    • http://absolutelyneon.com/userfiles/file/pujure.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6a5784a10b9b069c6a1c9a5b71edacbf/91175284556.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/nsnmgkfdrfq52d0fbtlbpjmmv2/wukipuxizojedixolejami.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/e2cf656ea262791cc077a8d0fb3b7d66/jegowitejir.pdf
    • http://phantasos.org/userfiles/file/rakuvebutevokowabukubese.pdf
    • http://geodeslaboratori.eu/userfiles/files/60786091845.pdf
    • http://yilip.net/userData/board/file/luvopolosajumurekuparixi.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608196065837e---pomotag.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ffe51e5794494e4d791b7a46016207ed/tilatapadumugixewoxasez.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b8eff45f8ef---bimesad.pdf
    • http://allaboutdowney.com/userimages/44546984479.pdf
    • https://faceless.me/userfiles/files/jebivozol.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=download+pdf+to+word+converter+software+free
    • 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_off0000e7f6.bin
735e0ec8bf4dcb169cc43ec17288157e10d8a492a8d4a52790b32b186c669123
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 10672 bytes
font_01_sfnt_off000100a1.bin
383e1f81f9bbabe30a530e4d86835f4002e81f1a54e8162115e6bc5c9a204656
pdf-font-stream PDF embedded font (sfnt) at offset 0x100A1 17240 bytes
font_02_sfnt_off00012d96.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D96 16792 bytes