Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea7efdda15e3b18…

MALICIOUS

PDF

88.2 KB Created: 2021-07-16 08:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 90c80ed774242efd02e2a870f753fe85 SHA-1: dc2e4f3530c89e9036bc9d2e6057bfafd8810b8c SHA-256: 6ea7efdda15e3b18e124c20c5d4f2da50450f53f1a2450f9e94b134d1ff9fa2c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of these compromised URLs and the PDF's structure strongly indicate it's used as part of a phishing campaign or to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072104cd6df6---40460273709.pdf In PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16079f790551b3---tetejesesodarenifefir.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/linozibol.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9189342b4f---32408475887.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160bf624466f03---66324706344.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/271997840.pdfIn PDF document text
    • http://reikihaus.com/clients/75291/File/98154344737.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/banizozibe.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071546659ed0---9183933952.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c170eb56e3e---rofapesuvasefodota.pdfIn PDF document text
    • http://bhsclassof70.com/clients/a/ac/acf0241a72c9eb28a719a759cf8a4748/File/xupadogofe.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/daf7913844cf7d2d649467c0f7cdff25/kabatidaf.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/cc6c894e2ad575149d31dc84fc797abf/81915844122.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6214ebafb---rilimewekamasurutejagabib.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/0b6ed8f7fb478d4dc43580a275d7eff1/13719070174.pdfIn PDF document text
    • http://massintech.ru/img/outer/files/viwaxomif.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/mizedabugikikonazos.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/zamusapazowese.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6e39cd9146749b678de45ab72d1441e2/66326819195.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/46797121368.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a241ba9412e---95411443740.pdfIn PDF document text
    • http://giadinhlaurenso.org/upload/files/miwavuvibowajiwejo.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/742ea279cfad37999b653423f19835fc/pinin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+get+your+prayers+answered+immediatelyPDF 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_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 11024 bytes
SHA-256: a4c03b5d0cd54141a4a95245d0e9279b84d34c01bd5e2c4160cb8402951360a3
font_01_sfnt_off00010f99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127AB 16788 bytes
SHA-256: c150d12b5a2e6892915bbf7bfdd221e6ebe2b792783acfe7bd30dcd1923062f4

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