Malicious PDF — malware analysis report

Static analysis result for SHA-256 766a6fa363604d0d…

MALICIOUS

PDF

101.3 KB Created: 2021-06-21 13:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b428841b661e713d0912b798be9b266e SHA-1: 71d06f8862986fde5b6bafb1798edb4672e3740a SHA-256: 766a6fa363604d0db4d997263cd39608004cc2b19353c9a0dc6d48404722addb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm with numerous URLs pointing to compromised WordPress sites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest the document is designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://chcial.ru/uplcv?utm_term=achutham+kesavam+ramanarayanam
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/pdp4mne6r1l8u9n3vjovrkd045/53372200440.pdf
    • http://phdpecs.hu/userfiles/files/96220328002.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ed278bee7d726d31cbd4a0606322b86a/jezik.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a2h7gj0l26kqotvs6ih78v530/wuvazi.pdf
    • https://anmoul.com/userfiles/file/bidiwamewatifozo.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/8734da18cdc6a6b49590e378bba57dad/11136009373.pdf
    • http://ikhmongol.mn/ckfinder/userfiles/files/39926893811.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c3302fb7b94bd0155857bcfa47d65e0c/99684184165.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/383915cfb0eb02f71ba0bbb8bfb9b433/62556134615.pdf
    • http://anhbanglaw.com/userfiles/file/ruxolof.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707bdff32c6---40984560975.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcb3017db2---50058120085.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1609cad2804104---zexivaba.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/cc46e1abce5145063e95d2f52a0bbea6/divaxumukajanib.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a688dc7caa0---62413126939.pdf
    • http://mega-gold.com/userfiles/files/16500388831.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b16de356bc---41256551420.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011731.bin
46a21c545b845131afa794805e8ffc6cadcdc95c72de8d59fde18ce81ebfe40c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11731 4996 bytes
stream_007_off00015447.bin
b8b86832eec02ae4becfe61fbe1fb095c0970424704c682415cabfdabb155ea9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15447 17120 bytes
font_00_sfnt_off0000ede2.bin
22be324b47c6e19491812ebb951d776360445ad737d0b23cc370052a94b0dc67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE2 5220 bytes
font_01_sfnt_off0000ff80.bin
252b81bf14c3b881a673a115c3e2c6896489109fb1e099335d095f886de83268		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 3000 bytes
font_02_sfnt_off00010b8e.bin
4cd60777e265fafd80a6c4ac8a8f541642313e2b1c6670a3899fdf55b12f51bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8E 3772 bytes
font_04_sfnt_off00012879.bin
14b1925daf52429bdf86d99b88f4a1fb540eb6255a05a0700d86d4b34465263f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 13444 bytes

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