Malicious PDF — malware analysis report

Static analysis result for SHA-256 211a40d0ece9948d…

MALICIOUS

PDF

95.0 KB Created: 2021-06-28 15:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 70f1656cd989199dbf6e8bb8316894a7 SHA-1: d5aa6984ab83d1128af415edfe6ef22df8813da1 SHA-256: 211a40d0ece9948da12e24198279c49c95eaffd05e5dfaf2543e814538de59de
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress installations and other potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://queure.ru/uplcv?utm_term=how+to+find+the+average+rate+of+change+from+a+graph PDF link annotation
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7d919dda8---54334574825.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e8c698760---40188819427.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/fikipagurufebidujijupu.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/xalunilamobajital.pdfIn PDF document text
    • http://franklinbristerharveyfamily.com/clients/a/a8/a8910385c57dfddac3c6311e2bd1422e/File/51744926636.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210505142400_647669123.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/hj052u4rbd8gbaih4qaii8j3mt/sewajatuxomovux.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/bd6bb7e3991fdb4f5f856bba1f7f85f0/58047859239.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/rarataxok.pdfIn PDF document text
    • https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/c7af0deb639f21d72d7c1c8f1a271853/38199444853.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090862237e63---zibirafovitevidew.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710f07cee89---70563018699.pdfIn PDF document text
    • http://volamtuyetthe.com/userfiles/file/9281085641.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/zewowafiserebeleta.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/de2227bc8beb5eb6457b8f8b92b099df/mixeviranowavofipexexi.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210614011848.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1609a49248178c---37900548210.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a17b22c633---54590026782.pdfIn PDF document text
    • http://m2m2design.com/userfiles/7609558953.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/04847f2f0aea7c278daed3542b86927a/91211483087.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e76d46dc8e---88975115842.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/16675485085.pdfIn PDF document text
    • http://armanetti.com/images/wuluwidojunefu.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_off00010f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F60 17400 bytes
SHA-256: 58e2806a2178a8d4b3ab7a0777ddea53863ba94f829880bb8bd69d63772aa477
font_01_sfnt_off00013d1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D1D 10996 bytes
SHA-256: 9c3e71e9a0f2397a6067b987e429824c685a8c83b0b680f3aaf24e6f09f3bbf9
font_02_sfnt_off00015641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15641 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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