Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c10a3b3bb75c04a…

MALICIOUS

PDF

93.5 KB Created: 2021-07-05 23:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 16a43d766765801611c31530e6841add SHA-1: 0799defd2cf1d893b9e97b34154280ab26e16be4 SHA-256: 7c10a3b3bb75c04ad272575dac2894e10576d4bff4d64f81d768cbacd00f44a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, which identified it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to lure users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

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://wastran.ru/uplcv?utm_term=new+education+policy+2020+in+odia+pdf
    • http://dralituncer.net/userfiles/file/xifazi.pdf
    • http://barksdalereunions.com/clients/869108/File/kiruvovejutebunosu.pdf
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160758efef2971---meviz.pdf
    • http://agiusfuneraldirectors.com/files/file/gidini.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b6aa64fcd---17819257169.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9ff3d653362376bd19e9340ae5435d58/13942229653.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/93c5769210433df533340d2bf5cdddfa/danedov.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/5jha190m7bj57l0isd80kh3tr3/38730021619.pdf
    • https://finatwork.com/userfiles/file/kamegipewewelibepu.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/fa9165ae9383f8e6d17e00f5cebd7a9c/40879566334.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607feaa3e17ac---medelaj.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/a4f77ff37c43cebde111587e7a814afc/fobobuxifel.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/o9u9bn6pa6q0ik15aroo8sef31/85181805106.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tupujagepituzelo.pdf
    • https://supermagnum-bg.com/userfiles/file/potesopovekafozewil.pdf
    • http://dermalab.pl/userfiles/file/mafibiwininikuru.pdf
    • http://jvcc.cn/ckfinder/userfiles/files/2106050859460106175kuk2.pdf
    • http://firegallery.ru/img/upload/nodujomelizililefefawe.pdf
    • https://aviseco.ro/userfiles/file/zotepemakisedupipawuwenug.pdf
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/62128020996.pdf
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a93200dfc7---jupuwexozuxufal.pdf
    • https://eyetracking.pl/userfiles/file/23720445081.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d0a91e5e29794c1873e132d6a1f85967/30110511931.pdf
    • http://fixafilm.se/userfiles/file/tamaxetevimutiketi.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/lofu164svvvk33rl4c3joqfj2d/nijulubisubukitaraliwalak.pdf
    • http://goteneplast.se/files/images/file/vonigiteduwepanidasopevew.pdf
    • 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_off0000f45b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 16792 bytes
font_01_sfnt_off00010c6d.bin
5fd6096ab34f4ca846760962403e1b8c89d33b2b41f0ba81083f4cf4e5446e09
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6D 16940 bytes
font_02_sfnt_off000138b8.bin
f2666e95f4599b990980a0abf2f374fe3006e34437484733904d739abeeb93bf
pdf-font-stream PDF embedded font (sfnt) at offset 0x138B8 16228 bytes
font_03_sfnt_off00014e9d.bin
33b30f2b9e3db8c6490b3109b93a66e5b1fa2707aae0d3e23822d96b1b87428c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E9D 10864 bytes