Malicious PDF — malware analysis report

Static analysis result for SHA-256 40797c4c7f40b715…

MALICIOUS

PDF

82.3 KB Created: 2021-06-29 09:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a8bbfd499fdf9d235d72746fa0b5552 SHA-1: 3585afcedad37b1fb3d553087a54b80410b8fc10 SHA-256: 40797c4c7f40b7156ad1a896601df03722b180cb46d1800764aa409fd95a4539
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The document body is unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary purpose is to redirect users to potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/ba9eaeb612a471a4b75b536615215221/butamudedemowupa.pdf
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/39a578977c799541a8416ac71f765040/weremepoba.pdf
    • http://aldo-ins.com/userfiles/file/fotepeloduw.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/8702662457.pdf
    • http://etenindex.nl/images/uploads/jubami.pdf
    • http://aeronautike.com/userfiles/file/97408816462.pdf
    • http://jkbprivateiti.com/userfiles/file/37628829240.pdf
    • https://bititechnika.com/uploads/file/93028008329.pdf
    • https://globportal.com/upload/userfiles/files/76212109341.pdf
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609de8149288e---5026322833.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7rhhpfsdtoddae3l2oknbqgf8s/wadaloza.pdf
    • http://barcelonasixtytwo.com/userfiles/file/zolisew.pdf
    • https://telewebmarketing.com/FCKeditor/file/64682050742.pdf
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16094298f6f496---74907107965.pdf
    • http://www.jindatunnel.com/up_files/file/29171309621.pdf
    • http://elementsgogreen.com/userfiles/file/buxiripogabiziba.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffb5e3acdd---dedumugizovepivawigo.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/46ac6bb8ac4f51b073147be50c36347a/kebawivejekatuzewo.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091a4e7b256e---zimipenovefobasevivero.pdf
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/2d178a4c192e2cf634afd5e75e7ee116/botukiwezajikoveludaje.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926a83e1091---25735326897.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/cc54708334b46089537622bf332f9e4d/6074631625.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=the+volume+of+a+trapezoidal+prism
    • 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_off0000e080.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE080 16792 bytes
font_01_sfnt_off0000f892.bin
a40740871d21c884421110e098ff495d83395ae23d19d8e2ed409ac27248d85c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF892 16296 bytes
font_02_sfnt_off000122ec.bin
85ccb118c1ea2a2e0bf57198a6598b2a7d1ce3e349f440811abfbb32f4455fb5
pdf-font-stream PDF embedded font (sfnt) at offset 0x122EC 10848 bytes