Malicious PDF — malware analysis report

Static analysis result for SHA-256 c614e50843a65861…

MALICIOUS

PDF

86.1 KB Created: 2021-07-13 19:18:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce9b40dcd469e0ed6512ced2aaf8811f SHA-1: 537e2a3d0259f5667b74deb93cdc42cb40558302 SHA-256: c614e50843a65861afe74c18d675d1d41673e37f6bb409d89433851af3e85062
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to potentially compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/tlegb2a5vlluogsnf97at90mts/debukopiwi.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f1e8b7c9c---sofikexilidibupuguf.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1125a05e8a---50968313282.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/192a0b4b27dbc9b6619c061dad00f426/fomav.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa6c66239f---puvik.pdf
    • http://arcenevents.nl/site/upload/files/18906763717.pdf
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/478877033.pdf
    • http://lroundup.com/clients/d/d7/d7466da0ad72d96b64793f89c518a0d9/File/fazumesidurejetaderux.pdf
    • https://pfhotel.gr/ckfinder/userfiles/files/bavutuvig.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1e92317d9---dotidipol.pdf
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e912746f---razexusevisoropij.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/812e2b1386b7efbfa2145f2b2745bd29/xosevakexuvumos.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b6748970e9b---5490807313.pdf
    • http://vote4dannybarry.com/clients/2/2f/2f5d4f67c16906f9b09010289963de11/File/655738653.pdf
    • http://driver-jazda.pl/upload/file/61974578850.pdf
    • https://factinet.com/uploads/files/42129034613.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608701af7299b---gamevemigereros.pdf
    • http://cnkls.com/userfiles/file/1625888150.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4343772b48---57497187930.pdf
    • http://acecaalcoy.com/userfiles/file/lidaxifijosafig.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8d480ef28---daguguwevadelubufapug.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a751cb87b6f4d2ad4b528c9515528e70/53925956175.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e3dfcf1b5ab---babixabozukumer.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/i9slfbfllo0vojspp0vvsnrva2/bumakuxadobipusakanawijes.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc42272b320---7983262765.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d062b6c142b---74804887449.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=veldora+that+time+i+got+reincarnated+as+a+slime
    • 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
font_00_sfnt_off0000db77.bin
6ace6ebb18a196c849ce1e9e7039e166de507ff318353726a0a139cf81440954		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB77 10784 bytes
font_01_sfnt_off0000f3de.bin
68e8cc8f8f799ebe53c8e25e5546a52c0b3d61ae9d60c4eaac69d5d9805e1de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DE 4524 bytes
font_02_sfnt_off000104c5.bin
cf79cff01a7902496bc4989dfd244d120faa3fdf0c6b722e9b52013f041f2f73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C5 16900 bytes
font_03_sfnt_off0001305b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1305B 16792 bytes

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