Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e0b10621fddc17…

MALICIOUS

PDF

85.2 KB Created: 2021-07-20 22:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 119652da0275c758214b64baf17bfd0b SHA-1: 2bb9e49839b001cb69325b66f268cd2a590b1807 SHA-256: c0e0b10621fddc177e74dfbeca1ebc0216e651d8855444ca0cd5d7383cef8489
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The embedded URLs suggest a pattern of distributing secondary payloads or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/minuvutitudise.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160c6469239418---mitanudefanata.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2ngvuckvelgkj7r7cj0vm52og/naduxuxiwibuvepozilizobor.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076fe7c9d6bf---11031385829.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/vaxewolotom.pdfIn PDF document text
    • https://mahae.hu/files/files/50198635005.pdfIn PDF document text
    • http://walkandwagforveterans.com/clients/9/96/96cc06f6b2a5429c1325f0b535cddba6/File/nudavatipepetosu.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa651580a9---87851141680.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f75829231---63342425164.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/xonegupezok.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/fujinumiloragakixusigala.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/33864847283.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/61337041905.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/bulowogafutoferidamijamal.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/5584782774.pdfIn PDF document text
    • http://jkohut.pl/file/40101327198.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/xinaporediremakedufukisaj.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/32738670410.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/pipivikasevul.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a15875d1b---8596453043.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a42d665f3de---37150628284.pdfIn PDF document text
    • https://777mto.com/contents//files/runivugenakugekugabizivad.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/58204423836.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/hv2edgoe6a5jjm4gjbfsuof725/fekutukatisegezovufux.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/53737410788.pdfIn PDF document text
    • http://fedime.org/imagenes/58356297338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ionization+energy+of+clPDF 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_off0000e869.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE869 18488 bytes
SHA-256: d418d614744c3728ce3e7a94877a0cb5fad499cba984d334573b38f94863b06a
font_01_sfnt_off0001173a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F51 10468 bytes
SHA-256: a27345bd8bfa630edf5b7c6c3a079ae1507c4ffc470554376d48daed1be45381

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