Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d24e44bd9366cf5…

MALICIOUS

PDF

84.6 KB Created: 2021-07-07 02:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dbde1509e1f7c47b0f05cb1ff16c396 SHA-1: fad725e32997fcf195f73ad41a1b744a6ac9cd7a SHA-256: 9d24e44bd9366cf5f127002caa8f10bd67a567d26fe2b80ef2ed7b962d38bc15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, indicating an attempt to redirect users to malicious content. The ML classifier and ClamAV detection 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 0.9951

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 http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cef8d2f4b1---62077538070.pdf
    • http://aryajob.com/user_upload/file/kefanozetajuwabimazufede.pdf
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/93a48b9d664c5e9bcfa07f217e43b031/88359480991.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be009a628e1---66052255137.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a761c38f196---28568560961.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/ib6746s460ef6q8kuji6srm8u5/42028638002.pdf
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff2edc9fc---40529791131.pdf
    • http://gasnguyenanhst.com/js/ckfinder/userfiles/files/kofowufodiwut.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c43tv05qoe6bmciu611vv00s43/pufixa.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/vh1g1rl6gujpbm0tp4inleoq97/41393801066.pdf
    • http://vinhomeshaiphong.net/app/webroot/img/files/31793586229.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085666b787f8---65155849830.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778af7b1fc0---nisuruwefotipoxowe.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081196ca0511---20388677507.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c029067d534---73928919119.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e15dd63e4f---gelejewunoz.pdf
    • http://n2nlah.org/UserFiles/file/16690053159.pdf
    • http://alarcon-v.com/editor_upload_image/file/lotaxoku.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/6tqgrbkk190d562d2valgm1st1/90504980431.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/07975cb0f6fc1127376aecdbcc7c688d/nanemivalumulewilobid.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074fec2eb0af---vekibuwerinupadiza.pdf
    • http://studio-rivetti.it/userfiles/files/bifumuforika.pdf
    • http://lalinpress.com/ckfinder/userfiles/files/xamowinarelowilebuwedol.pdf
    • https://auto826.com/uploads/files/jinewubuxobugodexelod.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=tax+test+questions+and+answers
    • 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_off0000e77d.bin
76d0613ee43652e816718811ae4536a53507940d3e47d8fd8f752e001bc9156a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE77D 17284 bytes
font_01_sfnt_off000114de.bin
865815fa8cbb7eb60d27013f91a2b894d94995cc1162c3d2a162f220c7b8a79c
pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 10592 bytes
font_02_sfnt_off00012d15.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D15 16792 bytes