Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d4840972d4e232…

MALICIOUS

PDF

83.9 KB Created: 2021-08-25 05:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 24022fd25e61408ad3af26b20268b1b2 SHA-1: 73855ecc418012ec04cecc305eec8bf8823bf012 SHA-256: 88d4840972d4e2326e333123780f8da79fc854f925f00f54b4e0f720d63305ba
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It functions as a link farm, directing users to numerous external URLs, many of which host further PDFs on compromised WordPress sites. The presence of multiple links to potentially malicious content indicates an intent to lead users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/66bdfeccec3709eccd03d0acbd6c7c93/pemogojolosa.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/dcda43e88234b51bc13682c68121ef5b/pokefubu.pdf
    • http://emirates-offshore.com/uploads/image/file/xokibaramopot.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5i90fbbd3uk09fdskdqbko3usl/burewapu.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51267f6da---punesenukifas.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/5o343f200jo3rb3rjuhjfr3i11/4233499056.pdf
    • http://www.mostenpo.jp/userfiles/files/49761513058.pdf
    • http://alumnicollegedelunion.org/clients/76066/File/logejivevilufi.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c22cac120cf---vogizewikogubeses.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e648746a231---81971531611.pdf
    • http://tensoinox.com/userfiles/files/342123219.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3028ff4215---paxux.pdf
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160df65b4a6552---92254829155.pdf
    • http://obrienbuilders.com/userfiles/file/38409729312.pdf
    • https://torbay.ru/images/uploads/file/lobowoxija.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/4680b1acdf84fe71db0ceb85f54ceef6/15811697124.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/6e76a962be5a054275ad7d94f2cd1d92/jakopolugo.pdf
    • http://provia-events.de/pics/fotos/1/file/38722897528.pdf
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e44249093032d941da1763f45edd202b/xozene.pdf
    • http://wellogo.in/userfiles/file///madutufam.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16100ea9ddfc9b---94595387988.pdf
    • http://envigest.cz/upload/file/wotekavamovegilewop.pdf
    • http://softwarefactory.nl/images/file/zolikavow.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/34bd3eef2b7e20bf107822ea074c7c50/badafuzosukider.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=teachers+interview+questions+and+answers+for+primary
    • 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_off0000e3e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 16792 bytes
font_01_sfnt_off0000fbf7.bin
21bcf13bd156fcf4bed42857b90cc0a62385f5023320d0346ece4c0db073d7a5
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF7 11316 bytes
font_02_sfnt_off00011646.bin
0c6ba0ea3eef53884dede1a3c2e6df01f55586e664d25542af144dd7d07a24c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 16868 bytes