Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a344ffac30fbd16…

MALICIOUS

PDF

95.3 KB Created: 2021-08-01 18:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e3b65ee91305c70db178e2c1ff35fe9a SHA-1: 4d4c7870056b1c6f6e7ee68447511c07e142072d SHA-256: 8a344ffac30fbd162bcfb461683aea9157a67fc389c7ea0959b787642b52e20c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/qcq8d8a3efhhdvf62a4psrmtef/49139709985.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/45f268ffd9dcf55192c27a585f5cf411/nafogusogu.pdf
    • http://jcbcharpentebois.com/ressource/site-image/files/kuxakimusigexopo.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/188fe322b5a57817a42efdb23f80c7da/wozagilomobi.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb38d6dff7---wasozejejemalemuxerobak.pdf
    • http://glamour-nsk.ru/ckfinder/userfiles/files/6836297723.pdf
    • http://okfilm.kr/userData/board/file/2594942025.pdf
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16083bf03e012c---vewemofejidedegeza.pdf
    • https://handinhand-daycare.com/ckfinder/userfiles/files/27643531238.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/3fb8655a154438857552ab8c9e72837e/zotizakoxuxukujuje.pdf
    • https://agronlogistics.com/userfiles/files/panipavanugekajeb.pdf
    • http://assushop.com/userfiles/assushop.com/file/jiduxerufe.pdf
    • https://khogiaydantuonghanquoc.com/images/news/file/zawotapata.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa9de97c23---nogakilukoxewot.pdf
    • https://prawobrzeze.info/userfiles/file/tubesofudevolebel.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/66299435110.pdf
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160829e3a941e1---14897924067.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc507df81b---torapojewiroxosotipud.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/mrappdegsnajft2e4ml7gcfacv/wopobozevi.pdf
    • https://immobilgold.com/file/japadarekenajoxapogumibiv.pdf
    • http://innobiztour.com/FileData/ckfinder/files/20210708_5CC8D43447EFB039.pdf
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e0a9a3b2391e5636f07e5482a15fa1de/talitafisapekofob.pdf
    • https://ozsersogutma.com/upload/files/ginotaberimut.pdf
    • https://valubil.com/public/uploads/cms_file/cms_files/vamatujudugaganijobo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=general+knowledge+quiz+questions+and+answers+2021
    • 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_off00010cc2.bin
23ce4ebc09be44f8eb8afd5382f92bdd3945dd8e9edcf2533fea62cade791403
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC2 18036 bytes
font_01_sfnt_off00013b83.bin
68eaf896f5f9db28f762cbdfe0d1b386b9d4294e987ffc99f546dfa77a465bb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B83 11240 bytes
font_02_sfnt_off000155b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x155B4 16792 bytes