Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e3d84c40a86116…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 08:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ca0ae9ac1f8f029fa53d5b85e5b07a50 SHA-1: b9aca64429347efdc8176f261fe8e9abe323f086 SHA-256: 25e3d84c40a86116532e7e6e84f64fc9b328cbe0889838a1a9d32b491cba0697
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or are structured as link farms on disposable hosting. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://drafthe.ru/uplcv?utm_term=i+am+in+dire+need PDF link annotation
    • https://telewebmarketing.com/FCKeditor/file/59037286337.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/kenikivevajaw.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/91989512715.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/vanuxutododuvojegoma.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/38311399517.pdfIn PDF document text
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160781055973b3---90856168334.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/nivad.pdfIn PDF document text
    • http://primehorseproperty.com/userfiles/files/dasamelalorag.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c33e3ea005b---98772500914.pdfIn PDF document text
    • http://abnicum.ru/files/file/josularuditisesikutuvob.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c476eb410d---disufuvesoviwutubidedifib.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/dekodeluzoxapiboko.pdfIn PDF document text
    • http://ibiforstarlight.ca/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/taterelofomidevi.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/rakomedakifodo.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/51760409460.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/15566326511.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/oa51137kdha1flsv7u5tefabqe/nibulafejisuwuxekiwa.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/7c4b3e55c5fddd0ea1eb8a1c0c9e424c/kesurolomunuleka.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/lanosefinofofirulazabo.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/53811553505.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/98591505059.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/1f79f77b27a6c3fa69076bf466b1c87f/mexidevi.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/e40064eae1bdec4b0a44e15598800ef0/41043624430.pdfIn PDF document text
    • http://inistor.com/ufiles/files/xalevosoruribozo.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_off0000ccf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF8 9928 bytes
SHA-256: 8625b5ef12a90a4ec75d74e28bbec91873cd3a83b5a2d1d0b5719b3c8ce15374
font_01_sfnt_off0000e2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B9 19968 bytes
SHA-256: 461ae8e9aad676763e6e0a16d2aba8d67da1fa014f2f0ffdb62e83c7851f8a6a
font_02_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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