Malicious PDF — malware analysis report

Static analysis result for SHA-256 558d36e088b860d9…

MALICIOUS

PDF

86.2 KB Created: 2021-06-29 07:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9437ab9500f465c94bee210bca8cb01 SHA-1: 8048577fcdb64581208d79ce84d9603dce043152 SHA-256: 558d36e088b860d9308592c5a4aa93ecfc5747a8959eb92ad0d8db8eaf58b3ad
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the nature of the document as a deceptive link aggregator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b1700ee3269---99190792234.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a947472201---63212367244.pdf
    • http://chronicles.ae/userfiles/files/vinipikolomabetowupoj.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608090721590e---8343889012.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce79829955---11704152766.pdf
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1608d918c4dca3---wubapimow.pdf
    • http://www.yoko-ono.be/images/userfiles/file/tenavoraleno.pdf
    • http://magogaralbamoble.com/galeria/files/98660568998.pdf
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/79b0c64c1af73123ed890ca8fdb6df21/21874567543.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/84c4b1cb52a1829c17e8ab4263d31ccf/jozoxepozekibuxerafokel.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/20932dd7ac55e5e078ed95adb1171574/famibuxivizojedoxuzogim.pdf
    • https://charterfori.ir/basefile/charterforiir/files/bamubanunedokewa.pdf
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/a86ced77fade246634301afd322b41cb/mixibotafe.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/gek79r9coitluhk6mhjf9gpk7f/67948557832.pdf
    • http://dientrotiendathc.com/media/ftp/file/43894544865.pdf
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/e92sm01d7utbocobkqo22rtco0/fezafizudidefefe.pdf
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/cfb8755301df8dfce879bc41aa0147c0/menuxofugowire.pdf
    • http://obasekiestates.com/UserFiles/file/15690527131.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a4a9597800929f9e2e355caaf0b98e99/6253084077.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b5966fa6e---xaxezegepuveposipi.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a390e3ad8f---78673655163.pdf
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f62456401f---54138073111.pdf
    • http://botosani.ro/img/uploads/file/12853996919.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acea2151401---ledanerikilupebi.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9ac68da109522a113e074e0d139716c2/35048459140.pdf
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/c52b764beaf727c271ed3e14204f003f/bibakobogaxatazojuba.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=diffusion+of+gases+ammonia+and+hydrochloric+acid+lab+report
    • 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_off0000e929.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 16792 bytes
font_01_sfnt_off00010140.bin
2a46dd289e67c597e01a5c7985ced3cebb18b0495d261dcece52c0ae543d42cb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 11424 bytes
font_02_sfnt_off00011b9a.bin
1b001df8cb5792133b3f6cf05e0a50fc59edb5d71d338badafa1b92c47e18fb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 17832 bytes