Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d56486f1749c5f…

MALICIOUS

PDF

107.9 KB Created: 2021-07-14 08:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1a4fd11c75ae01966b44611d842637c SHA-1: a6998524058b89ab4a855f8be9ba92645d9ed1da SHA-256: 43d56486f1749c5f37510d11ae46cd65e78fdb4b32b13343e9bcc97b3222908f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised websites and disposable hosting domains, likely for phishing or malware distribution. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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://garglob.ru/uplcv?utm_term=minecraft+mod+level+up+reloaded PDF link annotation
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b461bf584---nijetekewinibilijekig.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/82875846916.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdcef036c---goniwigalugif.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/nazejezazakefile.pdfIn PDF document text
    • https://luminex.pl/upload/file/likukifavivofedulo.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/215a01253a04d8a6c901ad0077640e4b/70988103967.pdfIn PDF document text
    • https://jotekonybakterium.hu/userfiles/files/59894589069.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/ec69f95e608509a0686428c11cf74b6c/vomerisigujexitaf.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f45f1f39da---13623792324.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16081d0b9b5a12---jovibesubupejebezoganar.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c80ec41737---jejukonu.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c93bf3c633f---86943858992.pdfIn PDF document text
    • http://bluedevils59.com/clients/862365/File/ruzol.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b9a10b6e4---88096294036.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/dosurumo.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e52f88b172---96598744387.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a9527f068---biwidelegowal.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/3762881704.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-29/20210429010734775764.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/6468684714113e93b9e0d7f336eb6fb1/7729926785.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608269d915013---27773302711.pdfIn PDF document text
    • https://dm288.com/slicice/file/34685755060.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011dd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD1 10772 bytes
SHA-256: 71d1666a41415b489262b2aae22e9fe5b51a542c216cdd93bbf2838db0d3e689
font_01_sfnt_off00013696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13696 20664 bytes
SHA-256: 333f0ee9d9ca41d5d833d574ff52711fb36005a1a22cfe8593e2a5334caf490b
font_02_sfnt_off00016b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00018354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18354 9748 bytes
SHA-256: 7e672baf40f5b84ecbf4c3260ed7766c6b5533ff5ff789eb1d09b314a70858d9

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