Malicious PDF — malware analysis report

Static analysis result for SHA-256 efc53ab7d3346da0…

MALICIOUS

PDF

847.7 KB Created: 2021-06-29 00:59:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 676fea5e8bae3e6e4cfcbb39d38eb71f SHA-1: 0ccd175c09a3656b80dc08828598b827419776b7 SHA-256: efc53ab7d3346da0dba1e44c05b106b63b1be601f612536d5635231c615feda3
104 Risk Score

Malware Insights

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

The file is a PDF that contains multiple links pointing to compromised WordPress upload directories, suggesting it's part of a phishing campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this. The document body is heavily obfuscated and unreadable, but the presence of a 'download button' heuristic indicates a lure to download further content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4567

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/6c70a2de0bb8951f9eb9d82272ee8ede/zitumifosasikunafabogez.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a02b46ad380---33840904951.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ba531b45997---dinilus.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/e2d3d42eefb74befb6a802217319e94a/58141632356.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609d0ddfda6d7---xejumexiwivumowi.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f9d67ed98---zixepumik.pdf
    • https://people11people.gr/uploads/File/kigulujun.pdf
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910f2a1ad7a---wadabokol.pdf
    • http://matthewsmillsreunion.com/clients/c/c7/c7863f7b93cb17915b2a89d887155530/File/lisudurafufawotilag.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9cf42ab3f9fbaa48488cf3c9d0a3c16a/vapevedopozonaredixidajem.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/45841760741.pdf
    • http://fullx.net/files/xukapawatoki.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757c56094cc---26999770394.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/6b6bee681f69b456acec397c58dec1ef/ludelopiditef.pdf
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/jidenepaduba.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7d29305cde---sobexo.pdf
    • https://maspacientes.es/wp-content/plugins/super-forms/uploads/php/files/olgofgpqsvl4isfp38hchfh2un/85334145143.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8db24ad76f---60068273729.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a91eb7e748b---nowudinozekofulaxusedapu.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/32903580187.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e56ac4643c---74335580929.pdf
    • http://thedewakohchang.com/image/upload/File/672020321.pdf
    • http://acpiindia.com/userfiles/file/6336782025.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=eel+infested+waters+wow
    • 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_off000cc457.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC457 16792 bytes
font_01_sfnt_off000cdc74.bin
b3d7d5bb0a5f4ff81e048e4b57e478c35fc45590639d65be6df38317de840937
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC74 10416 bytes
font_02_sfnt_off000cf444.bin
c24f2ccccf8613bec8e1cc3fc60cbbe9fe9bba3becd95681d23bb02bffe26bdf
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF444 21724 bytes