Malicious PDF — malware analysis report

Static analysis result for SHA-256 314e31908b9a8a47…

MALICIOUS

PDF

67.5 KB Created: 2021-09-30 23:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: ba158572ea4f9d51d0d9da7582ac8082 SHA-1: cf97023cb202e721dda28200dd0729ce93e7dc79 SHA-256: 314e31908b9a8a47fcfa00848c21431d3a0dd31d26d25aed577d8ed678dcc258
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 document contains a link farm with numerous URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://crysiq.ru/uplcv?utm_term=top+10+emulators PDF link annotation
    • https://aldapa.eus/files/galeria/files/62458711131.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe6db0f66e---47671059933.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/12889422730.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/40485604985.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/pisulikuvozito.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/zowopinul.pdfIn PDF document text
    • http://cartopack.com/Images/file/69608252598.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/44234662548.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/161400ab26b45e---60046982281.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/levizofatijonedeligeb.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/40675977068.pdfIn PDF document text
    • https://tanhaithanhvalves.com/quangcao/admin/file/lesisimoxikekoxe.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/23088936388.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b96a1da6e2---ruruxuxinezanutowuxidafu.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/lixul.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/lodupaxovovimuvukojunajif.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/99152394820.pdfIn PDF document text
    • http://oookub.ru/upload/fckeditor/file/47908363620.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/51032534114.pdfIn PDF document text
    • http://bfcy88.com/uploads/files/nevolodenibolomiralosel.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/59518253902.pdfIn PDF document text
    • http://zanethompson.com/userfiles/file/gafolesavax.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_off0000ac49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC49 14736 bytes
SHA-256: e56b93a5ea04aac84f312e2040e47557ac27e7f994c70d96cf0fec6a726a3e4f
font_01_sfnt_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 10452 bytes
SHA-256: 1b4950ba84f6f9ce5f4cfd1eb8862398e168eee20dd31054d224c5d7fc056bf6
font_02_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1