Malicious PDF — malware analysis report

Static analysis result for SHA-256 e20cbd0af43c3f95…

MALICIOUS

PDF

84.4 KB Created: 2021-09-01 19:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 34476c5b6776338ae4c3be0a868d438e SHA-1: a1fb88ee8c7c277de098dc744e5ca367827f29e3 SHA-256: e20cbd0af43c3f95420cfa820317355475dd3effd122248f7481716f3d8a3fe8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by an ML classifier as malicious and contains numerous embedded URLs. Several of these URLs point to compromised WordPress sites, specifically within formcraft plugin upload directories, suggesting a link farm designed to redirect users to potentially malicious content or phishing sites. The presence of external URIs and the nature of the compromised CMS uploads indicate a likely spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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://allytemp.ru/uplcv?utm_term=how+to+copy+part+of+pdf+as+image PDF link annotation
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c6618b3fdd---durakoviwebujon.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/mibewe.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16087f16ff1dc4---40817341512.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/kuniwulodemikuvejakep.pdfIn PDF document text
    • https://dadrarad.ro/userfiles/file/lawevetudogorevukop.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/15137361062.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/23418308370.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/g6ng2qmgth4050hs0tbv0796cq/gaxuzigiregob.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/sn2ap51puv3lbfs78d7l7p7c37/tasiwubovijabariv.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/52168408129.pdfIn PDF document text
    • http://fedoro.ru/upload/file/76847101098.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800db9b97e3---96140292631.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070413013260.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/52112445840.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee777dc799b---49545346119.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986c091fccc---duvuruwil.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/turenem.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/bogutimigexunumosamezil.pdfIn PDF document text
    • http://sportsgarten.com/editorData/file/98850807398.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/e4a0ba3bf3285f27159a02ba47790229/44058423974.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/20912004145.pdfIn PDF document text
    • http://stembridgefamilyreunion.com/clients/0/0d/0db03be1a97f3028174cafb645c8c91f/File/seluxiboxobaka.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/61816c3ee2164a55c7524d8899e6c45b/matenixovimamoz.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16086bdf60c862---ropogafoxi.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8b29b09aa---tuzapa.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/91162961595.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_off0000e3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FE 17256 bytes
SHA-256: ec93a34444e4a60f7f2e11ce79259b5da272a2a4acce2888abe71d25476290e0
font_01_sfnt_off000110db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F2 11004 bytes
SHA-256: b6e95b45ec5e8a0b3803926918fc715c1f7c0abdf4cd56c529dcd15bd9433dab

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