Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f21de912810865…

MALICIOUS

PDF

86.5 KB Created: 2021-09-01 16:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92386895117726941ece7518f9ce4aa5 SHA-1: 7bc4dac806bf6c192e8e72268db1ab51936fdb1a SHA-256: 20f21de9128108653a7eeaf03976f2ea5e6384fb857691ca829f48267b974277
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish for information. The embedded JavaScript is likely used to facilitate the redirection or obfuscate the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://epiphanych.com/images/file/59338981925.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/fec5e5106ee3a005cfd1136fe86e7326/39859966489.pdf
    • http://oreade-breche.fr/userfiles/file/foxakowuzumu.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/3533b5858ec55eaa1bea84671d100f2e/jazom.pdf
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210521082125506830d48pax.pdf
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160864ea2cc4de---31343182103.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/fabbc981ba1aa0f9fafd6f75104e92a4/sinukegebedupom.pdf
    • https://dogathermalhotel.com/resimler/files/73849147963.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/mudekegetilapexu.pdf
    • http://villa-carlshorst.de/sites/default/files/file/2174049788.pdf
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d56683588e---dutofopifinidirad.pdf
    • http://brno-skoleni.cz/ckfinder/userfiles/files/83856468659.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccc8e6e8e---fodeloguvid.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3560e5be4---65882868772.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7e923c1f2---dapegujizekomoburu.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/e52a537f9f68b35cb175e4bedf721ef5/79224613391.pdf
    • http://dragonera.cn/admin/userfiles/file/79609976968.pdf
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/70995008625.pdf
    • http://colegiosantarosa.com/uploads/imagem/file/suvujozakusijomamuvumolo.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/kimuxoxaxevewut.pdf
    • https://alatheir.com/atheirwsfiles/file/67198150593.pdf
    • https://plagij.at/ckfinder/userfiles/files/vomidakudavotofanimivuna.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/fsrt00s8l9f2vgmbqaq76b93m3/gupapa.pdf
    • http://barbusci.it/maisUserFile/file/76709667490.pdf
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092512285074---nuzorixalodoko.pdf
    • http://rakkhunnursinghome.com/user_img/files/51921640332.pdf
    • http://kochamsushi.pl/UserFiles/file/rixipewefa.pdf
    • http://lynxitservices.com/ckfinder/userfiles/files/91660830213.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=exercise+that+makes+your+waist+smaller
    • 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_off0000e95b.bin
6bdff7f60035abc02bc4806b2a6abcbb0a940f45cf2325ae0ffa50feb305bfbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 10868 bytes
font_01_sfnt_off000102a1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 16792 bytes
font_02_sfnt_off00011ab3.bin
c044c221a5798ab582e9b518322ec5f62cda2f63c4be7b84899301ef5da872f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB3 17796 bytes

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