Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d8be33115a314f5…

MALICIOUS

PDF

85.4 KB Created: 2021-07-24 07:37:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 883b1edc68198aa96757d06f1855a950 SHA-1: 152d8b23ac7f85b92c81389244de2453517fb06a SHA-256: 9d8be33115a314f5b8e9392672faad0c2669884e17edbb8156a5923ce4082bd3
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of multiple distinct hosts and the use of UTM parameters indicate an attempt to obscure the true destination and potentially track user engagement with the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e953ca22ec---75171801755.pdf In PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b6834b21---wutebarafabijuluge.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a336e130d6---wonarokanubeluba.pdfIn PDF document text
    • http://ontsgoi.shop/uploads/files/redezagem.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/9d0cd80570e5fcd9209d6c3db1d27952/sodazaxaluwiril.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c623300c94c---nosexaro.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/dubemefexu.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/piramivuxoti.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/78dc89682d591a65911684e0d12456be/fapuguvot.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/85cc0t96aiogqkoveeo8bifvum/wazigojezizujiviza.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/26502986294.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/xuxilaginoriremogid.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/5d70b428680b8063381b25ee4fdd4246/36462788732.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/65536334702.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/1341839513.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cab16d6f3b---10594768185.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/72988167995.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff2bef23be---sejenufeletulegufuxet.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/xanifid.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/8nenfg4hg20ll2m493t0k3d5np/10476666957.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/kepijarefefijisoxazoxem.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/41338390041.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/28070557124.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=avery+5+tab+printable+dividersPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 10700 bytes
SHA-256: 4f5bd2331f41d2eff234125007fd489797a8b17f93bf966a6654dd2c2a446fd7
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 17072 bytes
SHA-256: e99ba0a364fb1290519fbfb6300bc31f585652b3c6527b589c873590d5348d88
font_02_sfnt_off00012e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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