Malicious PDF — malware analysis report

Static analysis result for SHA-256 94fc60fee23fc682…

MALICIOUS

PDF

71.4 KB Created: 2021-09-10 22:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f69aa7d995b7ac10708e434b255d1f5 SHA-1: df784e8dd4365d006c30aa8f4f05200c8c4b1706 SHA-256: 94fc60fee23fc68230d351530824bd3b7236bc73f4d882d52cd006284750b5fb
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://soechi.com/userfiles/file/ratux.pdf In PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/5d108adcebc7efdccdde9e17d1fd6043/rajunawo.pdfIn PDF document text
    • https://linardi.ru/files/file/revufujafutelutenot.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/ziterenadezitawovejegula.pdfIn PDF document text
    • http://xsteelstock.com/d/files/6991750118.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/28473754413.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/83873278825.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/22212610198.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161316b2817aa3---domasimexegu.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a03dcba703---60493300024.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/pusuxesod.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137c6d35cf87---meletitukuleketirafalu.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/vawobajabedateku.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/96901190851.pdfIn PDF document text
    • http://yoshitomo-kokubunji.com/jcfiles/file/51193204450.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/lesajogejidakasepesare.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5d597aa95---49863839088.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613388f93e869---peradafubakukot.pdfIn PDF document text
    • http://phongthuydotho.vn/upload/files/18272028907.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/75394640661.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/93094549104.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/16753892406.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/vuwigibipibuv.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/5603970722.pdfIn PDF document text
    • http://centromp.it/userfiles/files/wunesokuxuvogurip.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/rofonujikasonepolijuz.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/69382065274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=pes+2018+for+ppssppPDF 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_off0000b7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F4 16124 bytes
SHA-256: c6b784e1aca73a866e5f376ed335c9bf321959c2b3b7cb6c73144047be68f819
font_01_sfnt_off0000e08e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A5 10352 bytes
SHA-256: 4ed86b5ed8464d6784ee2c473ffd9ffa20dedcd6adce9014bf1eec831a51f68a