Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd3cb94f204d5a2…

MALICIOUS

PDF

86.0 KB Created: 2021-07-07 22:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a95f10e826f742aa960c08d23b57d6e4 SHA-1: 059a443ce3c11f5f631204b446c2975a6644b93a SHA-256: 4dd3cb94f204d5a2ddd93e0f3ef3352cc07251a947234e8a97f97c568936f14e
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 contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the nature of the hosting (compromised CMS uploads) strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae58dda08d---pejik.pdf In PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/nuxebabujaj.pdfIn PDF document text
    • https://bselink.com/userfiles/file/dipojejirowogikameli.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/jiwem.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/32193088953.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f4d402460---samap.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/646ab27372633c4be0a233e120d29cc3/paxajin.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/509038019963363811af98ea16daf7b4/kowazofasudilabijubefeno.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/60335844561.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/df5edd10277ccf6da8310a515897668d/teziduwetim.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd59da8233---paxizif.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/nesagugusurumozubizazaxof.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607615f357785---64748221576.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/11223173683.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/fuxoxixajagixadilokux.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/782s7tr14ct430qvpchfq59qn3/dogapuzudimeruzevofarinux.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/lf44fff4k9tme5gld1f63ir4m1/59525171315.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608331ad9ed63---90272072455.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/takazilupojapiridarawo.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/52571880439.pdfIn PDF document text
    • https://songhongresort.com/img/files/1706959834.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b841eded446---87413108900.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/30220766696.pdfIn PDF document text
    • http://muszempilla.com/files/file/79771092030.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/a67aeba709ba11b37baa4823f838671f/kugagar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+draw+cool+sunglassesPDF 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_off0000eeb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB9 10632 bytes
SHA-256: c13474143a602f64f3bae0b1033f98fb365e9a91129e8804ae2f28002d20637f
font_01_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F18 16940 bytes
SHA-256: 372160f8da46046d710836ab020274920826aea6e18ba038adda0239bddbf03f

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