Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5efa08a91180bf…

MALICIOUS

PDF

108.2 KB Created: 2021-06-27 17:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecc5bc7886f36b4a423a31eb843a98e2 SHA-1: 230431830f87e861c0042352c083cb0a0451d06e SHA-256: dc5efa08a91180bf2d0f72eec591ddd468c7a03f215e9355448b10a2c3f2fa15
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attack pattern involving redirection to malicious content, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://crewmak.ru/uplcv?utm_term=who+is+more+rich+than+jeff+bezos
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b90010a6a36a2c15be74a9dc08b8dcaf/74046177068.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6a0f3f03a---38153393418.pdf
    • http://willbramephotography.com/35624651555.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/d3occ5igakpnnjg9g4e3fq7tp1/xuwirupupa.pdf
    • http://chinasoftcore.com/userfiles/file///91443518791.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/mdq1ocbven8hcnt4jqvq56ougg/82212287228.pdf
    • https://porterbrothersltd.com/app/webroot/uploads/polenidewivufup.pdf
    • http://kcde.kr/userfiles/file/tixumuxexidopivomo.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74821892365.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/57d6c6830e3ee80b1c26b43bcec010ed/37962587378.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/8bfcce3fb03407d7b6c5601446f364af/depobovevesita.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a09304018f0---5852120266.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e285d84feba51b5f5116f8af96e161aa/36528805091.pdf
    • http://alpha-cp.com/userfiles/file/rapaxizosipegovenunuri.pdf
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c5fb94f614447b5765dad1e3c0d6a3a/24742213308.pdf
    • http://dzbnf.com/upload/file///xulewetuviwukini.pdf
    • http://leinerpakgelatine.com/survey/userfiles/files/nezamofowizew.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609111424a95b---vijugipurilovurejezo.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b25a45837---19209318527.pdf
    • http://jamessham.com/admin/usercontent/file/siferarodemi.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16092ef672c1dc---lezefozobedom.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/fc4106902a93751302327ff60b7c24ee/8141409924.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_off000144da.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x144DA 16792 bytes
font_01_sfnt_off00015cec.bin
4d7cb151da53f000415a8c4d4b5f19981709205ca27244dca5304bc6db6025a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15CEC 17384 bytes
font_02_sfnt_off00018a7d.bin
ab125a1df17cc042a71976523100c53b602286c35b99813c8fd8f41f3627d592
pdf-font-stream PDF embedded font (sfnt) at offset 0x18A7D 10880 bytes