Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e874f25f77857f…

MALICIOUS

PDF

96.4 KB Created: 2021-08-31 22:08:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9666b99ee30ae858057c3a7d47febd6f SHA-1: 38e216fca8f0223f6d3b1ff0203dec6388bc9581 SHA-256: 78e874f25f77857f0c60e87bafa6f8debe67bf86ce1c0101a424b6542e2567c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised websites, likely serving as a distribution point for further malicious content. The presence of external URIs and link farms suggests an attempt to lure users to external malicious resources.

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://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/20c168e63ea16c6421955c42c7ae1811/falusixogiwekivo.pdf In PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/cb8fdbf9c3764983dc5c89c0b03eec7c/93003461285.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/24326909792.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a5e82329---23146240824.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/2871274862.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/pifineketozonedefofa.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/2059ab3541e6005eaf2d29b57e9f1633/dutuzusumobiv.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a551a39077---78046503166.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/f5524984fc7834ba6cac6282d88d0219/rosopowubarozufubitowox.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021070123054333.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/d92f881a246d682aa5de424a9c5f75d2/zewimidutotedar.pdfIn PDF document text
    • http://vksraja.in/fckeditor/upload/file/28054214169.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d52baafa7e---47391563767.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-19/20210519232131483831.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161122fe0c09c2---wusuzad.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/datipuxapawojidaxi.pdfIn PDF document text
    • http://technocom.pl/editor/file/11408752128.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/38110633786.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d2abb758af9edf2cc475154fbab0489d/96823202111.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611de241071a6---kaguro.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/kc5fj96ssrnqjm8a3c8nht3t9g/wunowimigew.pdfIn PDF document text
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/wiwunubugod.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac56890d8b2---vudezojasiwox.pdfIn PDF document text
    • http://alkanboya.com/files/file///41310677383.pdfIn PDF document text
    • https://music-group-store.com/upload/files/7459596508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=weighted+average+methodPDF 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_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001290a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290A 18924 bytes
SHA-256: adc15d096be30777e4f35a04da62e02f61b18ddf400f1bdadd3e7a691510d1c8
font_02_sfnt_off00015ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ADE 10436 bytes
SHA-256: 74fe8c0f9f6e4d199190644c2ee0299f3208ceab1c9111d3a5fba8eaafef7ac5