Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffb38f9eeaba746c…

MALICIOUS

PDF

105.6 KB Created: 2021-06-27 03:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8782b364ce5c31c3f19a01803c52ce9a SHA-1: 35f0939b0b5d5a76cece3211c8f52f06b355b3d8 SHA-256: ffb38f9eeaba746cf65120c5e95cb3194f36017c09628795ef0bf225adc2e1dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress upload directories. The presence of these links suggests an attempt to lure users to malicious content or phishing sites, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075f460d4e43---zekesabevanugaxurimelufep.pdf
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795e1d6db0b---75822533598.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160afb169017c2---23940445857.pdf
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d040c7a9d---gutowubatogasex.pdf
    • https://renault-service.com/userfiles/59834760486.pdf
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e22e838b586348b887af06f9b775962d/moruj.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b64ec71f72---pinekaraf.pdf
    • http://meadescafe.com/userfiles/file/11553560808.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607223457a508---47510887935.pdf
    • https://qnzar.com/files/gizipad.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fdf27398e---91753452627.pdf
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/hdps03jaugs0uolt3j94grkvdo/16448236057.pdf
    • http://kanstm.com/ckupload/files/46124319851.pdf
    • http://dianacb.cz/userfiles/file/52428290000.pdf
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/72g16lai1uglpiisd9uu48lih6/kewotiv.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ac483e3db71---bafakoxigumogubonir.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099bcaf69077---30593207121.pdf
    • http://bixenony.com/userfiles/files/besomabatorusatus.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/7374b166c22691381a93dd2a39a3e10a/98244106235.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b0c37da4f---dopuvexapubak.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/df5ouino28r8e8pappe611b7r0/26420540268.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609c11fd05846---temiz.pdf
    • http://robalton.es/Albums/images/file///lupopisupe.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4784ee96f4---11107972805.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084093b0724e---kazotazufalife.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=principles+of+economics+8th+edition+solutions
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011990.bin
16b081e75955ebf0a325e7f42bbeb3526d46535d19dc60a44abbac32ea1dc75b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 18392 bytes
font_01_sfnt_off00014a2c.bin
6c0a6fa198fc84deba7781ec0e936c82a2b55e04345cc893cdc61e30bb0160c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2C 11032 bytes
font_02_sfnt_off00016399.bin
a2794e832b191cab2e9f44eeb57154fbcca8cc038880a6b8014900bfc05a8c94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16399 16144 bytes
font_03_sfnt_off000178ec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x178EC 16792 bytes
font_04_sfnt_off000190c9.bin
aa05cf079b0d51a179545f5e62b3a4c6ff1088f47710f8d6c04d42c0465d7343		 pdf-font-stream PDF embedded font (sfnt) at offset 0x190C9 1224 bytes

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