Malicious PDF — malware analysis report

Static analysis result for SHA-256 c442cee075ce0355…

MALICIOUS

PDF

79.0 KB Created: 2021-09-01 05:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d666f59e1b7e41f237a6632cffda843 SHA-1: 9660da190405605cbb5d43ed629096ba3e488032 SHA-256: c442cee075ce0355bd102c538becf6cfbb2d07b9b43b87d66a771b3450465fb2
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are compromised WordPress upload storage. The embedded URLs suggest an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://rosenstein.lu/userfiles/files/pigesegele.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2526310714a4c57e18a653adefc94d8a/jivipoju.pdf
    • http://myphammonly.com/luutru/files/fasutofi.pdf
    • https://tch.lu/files/files/dorejazifusefe.pdf
    • https://bacninhonline.com/webroot/img/files/mofexidelividuxutazurixo.pdf
    • https://gad-elhak.com/userfiles/file/lonikeluner.pdf
    • https://rowadalbyt.com/userfiles/files/54594052977.pdf
    • http://coatsofarms.com.au/ckfinder/userfiles/files/90355803026.pdf
    • http://gldbirdgel.com/user_img/files/69386075312.pdf
    • http://aaaexpressheating.com/userfiles/file/64127465493.pdf
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/41230251392.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089517e8c693---jadawujijuzavuzopejujalu.pdf
    • https://roweryelectra.pl/app/webroot/uploads/file/16253933219908.pdf
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/62e94ddu4sc18r40g2ffs6rnde/4452675193.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611831f0a5f3a---35615653556.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b231c2e8887---38473634491.pdf
    • http://naturallabs.fr/userfiles/file/vugefe.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/1fc08415bacab2bed1486eb41117d962/19911760010.pdf
    • https://birsamundapark.in/userfiles/files/zuvanasomeluk.pdf
    • https://telenovella-bg.com/files/18966172112.pdf
    • http://portamarioarchitetto.eu/userfiles/files/lizuzumidigibezuta.pdf
    • http://satakantaresort.com/user_img/files/tuxolijijujumodavip.pdf
    • http://shiokuda1.com/contents/files/52190387687.pdf
    • https://proxus.nl/file/2655324121.pdf
    • http://liebherr-tr.com/userfiles/file/kifofadugopoli.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=new+year+party+poster
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0f3.bin
880def3a0a9faaba6b350255c9f8928c85aeb3f2b19d350de199c6820b76b792
pdf-font-stream PDF embedded font (sfnt) at offset 0xD0F3 10180 bytes
font_01_sfnt_off0000e7fa.bin
d0d4342d67ce4a12b8359a125fda980a531e39807329b80f34bc830f67d5cd65
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FA 17860 bytes
font_02_sfnt_off000115d7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x115D7 16792 bytes