Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f5e51c354fc3f6…

MALICIOUS

PDF

86.0 KB Created: 2021-07-20 12:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 14b73513220cac70123b7f62b3964251 SHA-1: 76dfbf8dc2a8b357ec0ec2d527d55789c4e7cd6b SHA-256: d1f5e51c354fc3f6a7e2e2d9ff5413e40710887e405135fccc6d2f2d01a77aba
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites, which is a common tactic for distributing malware or conducting phishing attacks. The presence of these links suggests an attempt to lure users to malicious destinations, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608195ab403d1---zomubigadinizikok.pdf In PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160abbbab5ad52---wawolikagilabu.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/25791485850.pdfIn PDF document text
    • http://sport-way.ru/img/file/97903850946.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/6fqe4qdiouu8iro88ncl4supqc/gobinutomoduse.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/40983969952.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/padegegijet.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/742f79aefbf052740bfc5aa0e3fa5bbb/fuzijomimiruwebetikemik.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/kijelulafozabidogudo.pdfIn PDF document text
    • http://chinocorporatechallenge.com/clients/6216/File/86550121182.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/rumez.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/sja76bllivg065p97ovisol07v/vonunikili.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/a7479d429fcdbe70a2d3c732c7168090/55793119845.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094a67027547---vadidokomojuzuni.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/24984300203.pdfIn PDF document text
    • http://mextro.de/upload/files/jipizi.pdfIn PDF document text
    • https://bbdirect.com/ckfinder/userfiles/files/42045869719.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///vororanuker.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/209140b36aaccecbb3e0ecbcbd5b9719/53438464627.pdfIn PDF document text
    • https://xistenze.com/files/files/61944245056.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/c7a691c9c6542436cf395c4d8afba626/82734083283.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/366e916f1d1a7be3ff0d10ead6f10e7c/futuw.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/furupevowi.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd866074a6---5435830558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=live+football+prediction+todayPDF 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_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 16968 bytes
SHA-256: 3978d996fab107530cc3e59912efaf362fe6ed2a61e369ad2e3552ef3140c306
font_01_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 10724 bytes
SHA-256: 7e8394175ce84d8da10418baec13713c14e1866da6e1f71d3575017ca0d66907
font_02_sfnt_off00013277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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