Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe85fe87cd62323…

MALICIOUS

PDF

91.2 KB Created: 2021-06-27 20:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d02bbcf60f8b1a121495a7484e8cbd6b SHA-1: a39742c30349c62e2843437a26168192f47e6d75 SHA-256: 3fe85fe87cd62323f18575aa6a61c794f025218bb2f15dff64376a940e96ee54
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous compromised WordPress upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and compromised CMS upload links indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c60e67d8924---ratafaror.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/7r87eg4n56uv3rdn1sn4gntqkc/47567989181.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098a0851f8f0---21915426840.pdf
    • https://egyiksem.hu/uploads/file/winazataruroga.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0e900ce7---rarikukefadodewuzul.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/eaa43f9d08a5e30ae81a230e7c20ef9a/28435866966.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a66bc6706---goxabolatiwipukujolo.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076257219721---wegojap.pdf
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b1a8d31e3c4758f3cb343de1f4c323d1/92683222216.pdf
    • http://gostinica-domodedovo.ru/files/faraxufovisa.pdf
    • http://shuswapladystriders.ca/userfiles/file/joweveg.pdf
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cc081d2027c---9110951095.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076b7339d064---kuzunilagugejab.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe88ddecaf---92961479956.pdf
    • https://ludifrance.fr/userfiles/file/55559032457.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16098728042d5d---74408742384.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073f42d1fb4b---74006514147.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdeb0dd697---binisadanupufet.pdf
    • http://zhengfutz.com/v15/Upload/file/202151631166440.pdf
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef6f3f7c457ba425019ef8dc4110dcf6/67634567787.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/60bac0e18e666fadd419419eba221bc8/roxinowoti.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=psp+high+graphics+games
    • 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_off00010130.bin
187a12360601a5f885b1a45f51b73c11fe3ed659f738908c8ec650f940a56176
pdf-font-stream PDF embedded font (sfnt) at offset 0x10130 10452 bytes
font_01_sfnt_off000118ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x118EC 16792 bytes
font_02_sfnt_off000130fe.bin
d0b8aa1f8093eab3850c959c33a207a58b1b7521e940548fed1085022f52a715
pdf-font-stream PDF embedded font (sfnt) at offset 0x130FE 17752 bytes