Malicious PDF — malware analysis report

Static analysis result for SHA-256 c016b157b6ffaf93…

MALICIOUS

PDF

1.05 MB Created: 2021-08-02 16:36:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 839129fab24733c34b58432ad69ee51c SHA-1: 4d4e4921d46cc4fee17054e9e181f8262b7830dd SHA-256: c016b157b6ffaf93290460c59d50e198a20a703afec508a709a2cb580965ff4e
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document that contains a link farm pointing to compromised WordPress upload storage, a common tactic for hosting malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt an archive, suggesting a multi-stage attack. While no scripts were directly extracted, the presence of PDF-specific heuristics and the nature of the URLs suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2540

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • 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://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/p67b696endsghaoqvcnr3n4fnp/rivavokekovowori.pdf In PDF document text
    • http://worldprint.su/userfiles/file/dukikuwodake.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/45400997572.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/miluvofufonukapaniza.pdfIn PDF document text
    • http://gabortech.com/admin/file/1941254368.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/tanejejato.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/tlm4asai2m9p606aqvfk9u5ghs/71134615252.pdfIn PDF document text
    • http://washburnhs64.com/clients/f/f7/f75dc469904bb25755ea64d7551c4a95/File/wuwepaxijilara.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/c263a91a149bfd850f1837c6bb7628d0/57930039036.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/vowipaxedevozotoguta.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/18004871653.pdfIn PDF document text
    • https://viticoltura-enologia.com/file/11526999853.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c6551a52b---44760857204.pdfIn PDF document text
    • http://musikpark-live.de/userfiles/file/6683894642.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3bef0792f1412f8717fd1d4411c99fca/3748597258.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eecd398514---5885602556.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e5eb30743a6---sivanabosuwar.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff1ce55891---49865208124.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/pujutilugapiro.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/9d3b5514fc67ca65b3d9ffc6dfcccc65/48921014035.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/84899259576.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/82029311963.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c572a06f---21886471345.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/06df6214066b898dd507aa537eec36b1/suzurik.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/dogewozed.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/8cf536622eab916d1755effdef874748/tunojifizafevodokisibiko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=shawn+mendes+wonder+album+download+deviantartPDF 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_off001066a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066A6 10980 bytes
SHA-256: d3ff0bc4a3d6e7438149b6fc336748c0085af4a9b20f752f5b0b3ab16b5c628d
font_01_sfnt_off00107ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0010981b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10981B 18448 bytes
SHA-256: 0391ba479b484244910ba5287f2f74ea729f9ba98742a59b0eee2d1b03502282