Malicious PDF — malware analysis report

Static analysis result for SHA-256 6917dc90c71b199e…

MALICIOUS

PDF

87.2 KB Created: 2021-07-27 06:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f179f6bb3b41e1824cb5e8e69a06b1e6 SHA-1: cb679f7fcd7f48f42969f0f91e61f71910f25b21 SHA-256: 6917dc90c71b199eddd8ee7f3f381f9cb9d3d80f1f953f7dcd50ca65c79642c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of link farms on disposable or compromised hosting further supports a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc17468711---wogeripomoxamub.pdf In PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb337cc8e1---96218807505.pdfIn PDF document text
    • https://broadcasthub.com/ci/userfiles/files/pijura.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160908ee6c0555---vezomilejomumevupano.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d49d1794---vewufuzureteguz.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/vasorubumavupona.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/24493119725.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/05c9b9e43b3f7ab644b57d84c15c184c/sotuxurolesisumeverukizo.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/18037133469.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/28490752098.pdfIn PDF document text
    • https://telenovella-bg.com/files/fukefobirelusiwo.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0cc1eddc36b7461436e31df596436bf6/11403424641.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/lajaviaapjvh2o838djsiu3m4p/16927537802.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/10839443568.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/o1i85vpaeo9v2qddbhgks1m2r6/88319060544.pdfIn PDF document text
    • https://realxenon.ru/uploads/files/21328185244.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/wizut.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/4ndek6ivc7ktt3dcotvlf82jne/22488322850.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0ca829ecf---kujobofife.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/pan79va5fkgi7lies0eneg7ieo/9239338431.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/fididoj.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/pekigara.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/davivupuguwum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+competency+based+assessment+vetPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/adb0841b90a66b51947b6cd99a3d6374/49858705965.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_off0000f124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF124 10948 bytes
SHA-256: 904df09d678461de07e7e5f607d76ddfd6a67681ae12a645e4e24aa36b299910
font_01_sfnt_off00010a37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12249 16532 bytes
SHA-256: 5858b9641d05007606b8e6be36a1bb2072ad2a48c2e6d5ca4b29ca383e0e941d