Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9a04a77bef6c896…

MALICIOUS

PDF

84.2 KB Created: 2021-09-04 19:52:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 39016c1bbef6a24433c96f02f503203f SHA-1: 83b61fe14976798ee17c99a0a3fd12162cc27747 SHA-256: d9a04a77bef6c896be4b947423e627952f63ad2b4cc0c4981096a97421d1cd8f
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites. The primary purpose appears to be directing users to external, potentially malicious content, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d7854628fb---20322271505.pdf In PDF document text
    • https://qkon.ca/images/file/gomomowuwe.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/fa9ddbdeb4ea26ce7528db5eae2c43f3/9390705289.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a074652ac41---zabalasenuwemadagowudub.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7c47a703.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092335376e09---nedifaji.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/885cf9059e2d8ff4a095696374ad7c6d/buzurinerusa.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c47c8112a---mewudubofupunod.pdfIn PDF document text
    • http://loadcell.vn/Images_upload/files/21933751029.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/db93ac232535cca6d3bb6408317f559c/wadarevijogokuxeruw.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/guliposuvu.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210831_014842.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/kizek.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/78279085667.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/73500552329.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/kujob.pdfIn PDF document text
    • http://pataibicaj.hu/userfiles/file/torufujim.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607922a58d171---gojekolonuxudowu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/uklq8clikto14s0u3ensn7m9p2/jifidadimixebana.pdfIn PDF document text
    • https://hahapediatric.com/uploads/files/202108231335577023.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b944d649fc5---jasejifazebalivitamatoka.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/bosipugadutod.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gaduzonez.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/kudikojinorifasajozeluni.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6782e5f848d17cabc0d6e67569655206/voliwu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=neurological+examination+dog+pdfPDF 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_off0000e413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE413 10972 bytes
SHA-256: d59730703266be89e39dae1ac4332ae5576ae2e96a09e1fe069334fec5d7e08c
font_01_sfnt_off0000fd4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4F 17360 bytes
SHA-256: 3c9974ed8b4989a05fa8001803beeeccd7577c38d2c86d84872ed6416e8e2843
font_02_sfnt_off00012adb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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