Malicious PDF — malware analysis report

Static analysis result for SHA-256 e373cd0ecd692f0b…

MALICIOUS

PDF

76.8 KB Created: 2021-08-05 05:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 414d4aa3df92bb3f656c6dcb2e91ded0 SHA-1: 3bf6bf5e07812c6c36d883014bc8f7e771787bb2 SHA-256: e373cd0ecd692f0bf2c1f5826dcc5a1f6a45f849285a05fdeab64b56922cfb35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://medvor.ru/uplcv?utm_term=mercruiser+service+manual+14+pdf PDF link annotation
    • http://bigband-ulm.de/userfiles/files/73778651604.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/bedobiremojuguxasulori.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5466d0af3e---58789604666.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/77458463471.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210526025157.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/567e7deeeed57a7b75efe49f45db2478/44777086670.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160729e0905907---napikikitafuwobubixumap.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/jopufiwufitu.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f137e68cc1---9031831731.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/43821047380.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/xafezezuroxiwabil.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/davimavetajijiwixagopezos.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/nuvukirifuwis.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/25131d40456a72cacff6835b5e16d088/74064020506.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/857173945.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/46415877607.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/9f3a2600e6d3a9a16583dec039c4e65c/40249998985.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc53700219a---54200647261.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/e432964de55b377f03057a799309d4dc/nipusesuriwozesodenumaju.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/gilebap.pdfIn PDF document text
    • https://papiratisk.cz/soubory/dagetogor.pdfIn PDF document text
    • http://cintabogor.com/Uploads/userfiles/files/69946150429.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160e1c11e3d458---522189895.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/66907447119.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/28666982643.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/niwonupijor.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/224ceaf8fed1fc99fb9421d1bf3f9b5a/xawafuzuviz.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_off0000cb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8E 10852 bytes
SHA-256: f8449866492fa973bc7791b8f547f85c1c9354c90e75e8dc4e73e8023585f853
font_01_sfnt_off0000e4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AB 15800 bytes
SHA-256: f92c4d586a92f01caae2b4883a25e44cdc6dd927874ef59b8de15a5459d62065
font_02_sfnt_off00010d61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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