Malicious PDF — malware analysis report

Static analysis result for SHA-256 b65aa009d2ab1f03…

MALICIOUS

PDF

84.6 KB Created: 2021-09-05 20:14:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 545d27a0ddea42b28dcb71b637e39caa SHA-1: 6e4caab90f507a5b72633c5a8512c68c80e7df2d SHA-256: b65aa009d2ab1f031ea95983e6b22d37a4b667b515c77137fab44fd296cd6647
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The embedded URLs and PDF link farm heuristics suggest the document's primary purpose is to redirect users to potentially compromised websites, likely for phishing or malware distribution. The presence of multiple distinct hosts and UTM parameters in the URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=impact+of+store+environment+on+impulse+buying+behavior+pdf PDF link annotation
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/301pc79vnl1tvf3b8f1sn386j7/30718733030.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/23407673727.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/47290609258.pdfIn PDF document text
    • http://kutscher-customs.de/gfx/userfiles/files/59057941487.pdfIn PDF document text
    • https://hsse.cl/files/pesomenidadose.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents//files/losisulufedivaxixugopa.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/10991294799.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/xozevegijogelalabufifinot.pdfIn PDF document text
    • http://rivebistro.net/ckfinder/userfiles/files/19048515842.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/17695124000.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9233cb1b3---jawatarijezef.pdfIn PDF document text
    • http://meyergarden.com/ckfinder/userfiles/files/43247542285.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/s8sr5cir0g8m2lq635l61rtgb8/wewudefa.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0cdf19fa81---mofumobav.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/tefopugorafi.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/69066931741.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/gonokusasufek.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/74900633155.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/lkoj2evhas9hrb2h36j8ocmbud/terilawu.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/17138588567.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087b63282af0---voxugofutagojebi.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ad53f467f67d6070b9b3c5a2262a7026/63608288450.pdfIn PDF document text
    • https://brod-plovdiv.com/images/wolupesoxanifumetus.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8D 11436 bytes
SHA-256: 5218ef67232ddc0e83b0a7a8b0947e6bb9bfe0bc62a2d12a90a15b8ff6d435ee
font_02_sfnt_off000115f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F7 17668 bytes
SHA-256: 71ccb00d67fba867787131d66ceb707d648285fab5052964aa21a81bc4efdc3b

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