Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3d7848374b44e58…

MALICIOUS

PDF

89.4 KB Created: 2021-08-27 19:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1682d421ca376363d26aab979b120560 SHA-1: bf4a38879b91dca0a231cd555729f1ca6322cc8f SHA-256: e3d7848374b44e58ca3a9ce5750c991cf478325d4c8cfc74b2ff9e63d363f3d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.corridar.com/wp-content/plugins/super-forms/uploads/php/files/9l866oovnvj1budngrtotfmirc/96851928045.pdf
    • https://dagvandearchitectuur.be/_files/file/58469939066.pdf
    • https://premiersuli.hu/files/files/maxenanix.pdf
    • http://mehmetrasimmutlu.com/icerik/file/76237496805.pdf
    • http://www.majbrno.cz/uploads/files/40951021414.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mbbos7hrs06o87mgnp847bih4h/gakilimimisonud.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/c20f299ab23512228ca44610a37350d2/pidixufibafafax.pdf
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/nefotelerejenetiguj.pdf
    • http://volamtuyetthe.com/userfiles/file/54588237837.pdf
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/16534175157.pdf
    • https://cleaner.pl/userfiles/file/22686919093.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609406c102fd0---gilaguvavodubiledan.pdf
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/r6ervg95bobgctt6t61t25bf3b/15534060706.pdf
    • https://adikkedua.com/contents//files/5607908200.pdf
    • http://niestachow.pl/data/aktualnosci_imgs/file/13198771707.pdf
    • http://sushi-belovo.ru/files/85205190298.pdf
    • http://softtox.com/new/userfiles/file/pubafuvoluwusizo.pdf
    • https://jasmijnbloemengroen.nl/userfiles/file/forewejo.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/bde8d009688d1724a5c5a2ebf68b977b/mewedus.pdf
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210716063835879939elmfh4.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ce94eec190b94b33b194045861b8eb49/bowiselozezarabopojevup.pdf
    • http://alibabashipping.com/userfiles/file/varirowaporepekiki.pdf
    • https://beyondpins.com/calisma2/files/uploads/kaxijubosom.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/53ed5128bffdf24d2fbd77294cc9c9ca/19785908408.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=spay+a+dog+meaning
    • 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_off0000fbbd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBD 16792 bytes
font_01_sfnt_off000113d4.bin
67743636b6113bd2493053a4f6b076a837220224bbcec4ba94d920bd45950373
pdf-font-stream PDF embedded font (sfnt) at offset 0x113D4 10512 bytes
font_02_sfnt_off00012b7a.bin
15d0335a3b79d6b7aed51872b81eacdf307c6d36a15fad84cc570f39c3f717c7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B7A 17180 bytes