Malicious PDF — malware analysis report

Static analysis result for SHA-256 da9b11a63ce3bb92…

MALICIOUS

PDF

74.5 KB Created: 2021-06-28 18:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4dd8fdeedb26ed551387b7eca648b334 SHA-1: bc2de1b3ad5e5d917d976d3876853c8ac4b88e3a SHA-256: da9b11a63ce3bb927d5cf969609eb81450d4de4205ffb9a60fd4116f51dab0a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, directing users to multiple compromised WordPress sites and other disposable hosting domains. The embedded URLs suggest an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://allytemp.ru/uplcv?utm_term=i+love+you+since+1892+lyrics+by+ica
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c9b232833b5261fa730208de2a77cfd7/mexemerasesu.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cadd6bcb9e---82741760455.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/dc6rngdup729bjkfokvatlv4a3/nugimarexamajixe.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/jamigoselan.pdf
    • https://iword.de/userfiles/file/80286954820.pdf
    • http://vmkmsz.hu/userfiles/file/59605156373.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/f27852381d62580733a5f1ab4596a25c/nulotikoxogukoguzi.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/128df2974f96952fb54dfdfa110c85db/nazinixoke.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/1ab8dt54anmoro9cmakeft43cp/59704563671.pdf
    • http://doktor-okonski.pl/uploadimg/file/87644296985.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/mocfqf840kruplh6bhhiienui3/riposobi.pdf
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa9ca2d3c3---felobitowuwo.pdf
    • http://www.darvidproperty.com/news/file/19339118343.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861daa3ce17---tizosovogovoregeremuse.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7317300bf0f645f62dd7370b10ed3e49/87514456191.pdf
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/fasabo.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/877bec6508405ed22e94c59ffe0dbfd5/66062223169.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b93c4ec1b19---jonuteje.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a8ddb3578e5ba4db017cd5f2cc1813f5/95175354496.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dd4acc96f---94626200568.pdf
    • http://eurekaelearning.com/upload/news/file/refisosanozexuxad.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/2b152ba9148038d959407ff6e577bd92/nabudejev.pdf
    • https://floridainvestment.cz/files/file/sozatifobotedut.pdf
    • https://djennebeads.com/nbloom/fckuploads/file/lefotaromoge.pdf
    • 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_off0000bfea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEA 16792 bytes
font_01_sfnt_off0000d7fc.bin
f2aef9d0ffdc83d9a3346dd3dec9c3051e89d307127510a77a6195c4386f45f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FC 16936 bytes
font_02_sfnt_off000102cb.bin
71c23643a26602ebecbea5c1649cd71154feacae9d0247cdc1b95a2076e18fda
pdf-font-stream PDF embedded font (sfnt) at offset 0x102CB 11044 bytes