Malicious PDF — malware analysis report

Static analysis result for SHA-256 8864a249e5168d8f…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 01:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: faf368d09d4042d48fd1f88e80b6563d SHA-1: 91fe95dd0c2d2534985d4ea8fad7f3c770a13c04 SHA-256: 8864a249e5168d8f6c87c5678abb9121c392b591dc415212d8c77b5f66686e89
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URI links and the 'link farm' heuristics suggest the primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=stereophile+november+2019+pdf PDF link annotation
    • http://bienbao.org/uploads/files/51070141168.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/30525724549.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/widuniloludesugusopep.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaefa019d5b---zosakowodudigilinizifo.pdfIn PDF document text
    • https://hostessima.pl/userfiles/file/14433633471.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/9a5a771d438a8b0624d33d9f2e3b8973/14929892879.pdfIn PDF document text
    • http://queensparkview.com/image/upload/File/33585651416.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/22407880593.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210517093236.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/88775402721.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/81365645005.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/17207499741.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607255ffdeb38---jufimevatejas.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/g0mph3h195g61jev074juitga7/56672846156.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/83303223420.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/bd08e05173883608c2d44213fce85a30/26519310259.pdfIn PDF document text
    • https://stealthwindow.tw/uploads//files/202108091232428089.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/878dfe3efeb9cd9cdfe72634d02df667/80036285510.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/59859612411.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/17995281474.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/86172987591.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/f6e1c0d555850b6fc1d8fadb6fe6a2d6/xafimirebomaxonivavexe.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/c74f6def77e3a5aa75159c629cc396ae/pilutidugijor.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160906a90f049d---wimulesonowoxumat.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16078a5489ae90---25221160527.pdfIn PDF document text
    • https://positive-feedback.com/reviews/hardware-reviews/audio-art-sc-5-eplus-speaIn 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_off0000e7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B2 11176 bytes
SHA-256: 0006dd69d5cdf8f6df22ad9fd0d124b49778d136b59b404c00862f9123c1d034
font_01_sfnt_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 19296 bytes
SHA-256: 8e60cd78b0926e9323b6380aaac8bb3ffd603d3debd34b9bb1d0978fc9813bd5
font_02_sfnt_off0001337d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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