Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e1c7ee55e5e79f2…

MALICIOUS

PDF

74.0 KB Created: 2021-08-31 23:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6703ad78b3a5cfc97e9da3f73fa46cd1 SHA-1: 2d0697772c5e46b606542c457cc22ed8eb807d8e SHA-256: 5e1c7ee55e5e79f24a8d8fd0a72a23af891a18a8120818c74bd81a5c3dd90379
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised CMS uploads and disposable domains. This suggests an attempt to lure users to potentially malicious sites for phishing or other malicious activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://j1medical.com/uploaded/file/mozepuvatis.pdf In PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/datimowezi.pdfIn PDF document text
    • https://tessuno.com/upload/files/6103499ce5897.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a474aeb66131dc9695a3db5f26b5ddc6/24545871727.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d3eb9bfa---zutiterun.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/19361578979.pdfIn PDF document text
    • https://roc.mn/uploads/files/fofedaki.pdfIn PDF document text
    • http://snsi.jp/image/news_file/velimotoranetanu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/zevizofarogipog.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/94020907968add11a5ec9f6ddb298fee/tinixelabunoburimopu.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/47966274696.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609efe0e7fcbd---36647027534.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/77a57e68e2df4d916fae50ad7ab9318a/27308768910.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/85m3ccc7e3gr4dihofq9ke39ph/72739888834.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/lodamawajurarodarupu.pdfIn PDF document text
    • http://sandsflooring.co.uk/ckfinder/userfiles/files/25260045714.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/k3u3jib766nvpl6mrdoa4ud97m/badulekigegazepatel.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/74733587890.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/86487255162.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/2a8d4e0a48e6af3b8a271a5ad1ec9101/kopurojosemebiroreze.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210727_8177A88AF3E9A764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=to+which+account+in+the+balance+sheet+is+the+net+income+or+net+loss+transferredPDF 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_off0000bebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBC 11032 bytes
SHA-256: d80e2708e9f7f27271503b1c3b1616a32e15394a676b17359413caadbfd5ef2d
font_01_sfnt_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 16368 bytes
SHA-256: 468547e64103b640e9dbb9689f387dfddefd0a2280339c7d505ac075cca222f1

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