Malicious PDF — malware analysis report

Static analysis result for SHA-256 d895dfcfcc08ba12…

MALICIOUS

PDF

86.3 KB Created: 2021-07-18 07:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68a9b7a766f3ec8ebdee2e57917db3a5 SHA-1: 86e264d0f55be20faf0f0b9742c2a5163c401b75 SHA-256: d895dfcfcc08ba12babd1f232cfcca4155e82da2e9a600def65093aff8f9dee6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised CMS upload directories, suggesting an attempt to distribute further malicious content or phish users. The PDF itself does not contain readable content, but its structure and embedded links indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://alacarte-design.de/userfiles/file/79353309245.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c4859ec016f---peleduwij.pdf
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91058ad05---fimokafapefolilodoxu.pdf
    • https://hotelindigha.com/FCKeditor/file/jodiremejujukava.pdf
    • http://agnieszkapawlik.com/userfiles/file/51318521079.pdf
    • https://mundolibre.cl/uploads/userfiles/files/43074212934.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce980c4e1---nepitavorujom.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f32a5e70f---xuganisisideji.pdf
    • https://pbchistoryonline.org/uploads/file/41659978965.pdf
    • http://flywings.sk/UserFiles/file/zasaxiwesovef.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4fedb8b507---liwuwurozemedudavige.pdf
    • https://unserbiokorb.ch/userfiles/file/12039484054.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607152a1b445c---futixosanotixejibepibus.pdf
    • http://playitdirect.ca/ckfinder/uploadfiles/files/71636503889.pdf
    • https://sca-kc.net/scauserfiles/files/vipapubirezuva.pdf
    • http://thunderstar.cn/userfiles/file/20210519181137673586327.pdf
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609fffd5b8015---dedag.pdf
    • http://kimandyoo.com/userfiles/file/godaf.pdf
    • http://ankaser.com/userfiles/file/30051415979.pdf
    • https://atlastoursntravels.com/userfiles/file/mafira.pdf
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506033132439320.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/4dp3e1hgpqnm9gbn6dqo33ulh6/97979784761.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16092593b87b06---meloxedonojulug.pdf
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/h68fvvcms9h5lpb1pvtrvvucup/83774555894.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=coconut+oil+and+tea+tree+oil+for+yeast+infection
    • 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_off0000ed81.bin
b979e30e510c283a95b99efa62207d97294317acdb30790f3a11ef9138e91bfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xED81 17324 bytes
font_01_sfnt_off00011ac8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 16792 bytes
font_02_sfnt_off000132df.bin
34e52f072a89437e54647b531aec3f5e880efb6a0f7cb4e447fe6052f1b8295a
pdf-font-stream PDF embedded font (sfnt) at offset 0x132DF 10712 bytes