Malicious PDF — malware analysis report

Static analysis result for SHA-256 d370be3b01f6c37c…

MALICIOUS

PDF

79.9 KB Created: 2021-08-16 20:34:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ebd1f228cb2471ac568d591b4cb3524 SHA-1: 31f79dc4f5b4af021ce6c7efa88cfd59c6a4ac84 SHA-256: d370be3b01f6c37cf67535473a4b8aad448916066a5934d01064bb1749ba6713
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites or disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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=adjective+clause+worksheets+pdf+with+answers PDF link annotation
    • http://tipiland.net/upload/file/vufiruzuvuxavupegemi.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/zifogowelerunalosov.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d559c19c864---tetalobebalujumesizib.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/gazajunevovimuture.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/991322a7b1e0244310de03de14f2ce5c/gamowibevedisawisatumi.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162619604070182538950.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/22693712904.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/161196aa185503---xabiwazonubi.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/251035063533.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/3bc2bf32f5670f9a10c0fa83e418ffed/nokepalevedomovaviw.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/73892013386.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/20904288788.pdfIn PDF document text
    • https://psiakocky-potisk.cz/webpagebuilder/ckfinder/userfiles/files/pisiru.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/58639637ac3dda020ad97010c9b87830/76190110920.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/9f5f265437ef536299f47212cfe11753/66321954819.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/xirajuxovuwo.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/suzuxaguledenokonobo.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/9813942073.pdfIn PDF document text
    • http://rana-international.com/userfiles/files/92271587386.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021070204311373499.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cff44963d4b---xadefupebuvemozutef.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/jegagene.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16073e6f111f60---1925758716.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/86da9c947e991ee6bfc8161445bdd0fb/84936206248.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/26925672517.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210717173845.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_off0000d45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45B 16628 bytes
SHA-256: 7173c2cd1b219259bcab73e632912c6615416b704d596aa9a7dea3dcbfe387c3
font_01_sfnt_off0000ff05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF05 11172 bytes
SHA-256: 52bc3c60b690c5bde453b4bc37fe3c9560a200a86ee2b4b9a98a81e00d5355de
font_02_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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