Malicious PDF — malware analysis report

Static analysis result for SHA-256 0df72b6e1d0ba84f…

MALICIOUS

PDF

84.2 KB Created: 2021-09-05 13:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dc7ebda78f461f549c9601285dadb798 SHA-1: e7328eaee6d2930d4a33eae46fc91bb55ecc4594 SHA-256: 0df72b6e1d0ba84f2244822740f32b0f161110a043df2d19cd87ff40bd18bc0a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and ClamAV. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded URLs indicate an intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://ketchas.ru/uplcv?utm_term=std+5th+maths+book+pdf PDF link annotation
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9ca1f66a---loxobiwuvafeselafexale.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/62851321413.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/qqgv5dk2s40m10s6fpdpksecal/medigeg.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/27832644757.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/sudenigexomivo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b4f3f0408---35643722640.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa382e802f---50731788405.pdfIn PDF document text
    • http://kmsenior.org/file/files/24767916521.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/kobavupixupefonerexokud.pdfIn PDF document text
    • http://fashionflutters.com/ckfinder/userfiles/files/93145228961.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8acecaa63e---sosoduwogaliwep.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/82101827265.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d94880414a---mikekitopezarali.pdfIn PDF document text
    • http://huiking.cn/uploads/file/051106166920.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d4d973b0---mujebunewu.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fea5906ba---mulerodifimeratezarog.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/zuxapuxezat.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/xitunisunimuz.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa5a36aa66f2c070f69f8b5c1cf58121/60347776672.pdfIn PDF document text
    • http://cichanski.com/Upload/file/48990792631.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160e91116cfe3d---90240147571.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a9b757d94---fizevubiximazadapizuj.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/cfdd533982cfca8d1169d9a03f58c0d3/valamavoninisuluxopoxuv.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/83933405450.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_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 17548 bytes
SHA-256: 9240eb59852cb2e6dbf4be90561aca3db59f727a3dbc891bcce9e45729ee18b8
font_01_sfnt_off00011309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11309 10728 bytes
SHA-256: 2b2650f51567054a0d895ff52eeca4f6e766e28595e60782294daf2ac70aee03
font_02_sfnt_off00012b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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