Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a280f788d25fbd…

MALICIOUS

PDF

84.3 KB Created: 2021-06-26 01:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3b4d4f460af8f0223a9e80e625f1359e SHA-1: 688d615a3a109e3e036f4df112a985754a653a9a SHA-256: 71a280f788d25fbdf5d9b8a2dd79f6a2af3864625205618c2280a97c6cdb53c4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple compromised websites, directing users to download further content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates that the document likely provides instructions to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/e283509598f2f7619c7e4bd75bee3ad1/xubujubapopagawijomal.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f45246959b4511fe735dbb3f1dd26b75/82331603166.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/wataxubebenarodirow.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086597d12e65---vevebidowu.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/gorowog.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/gupabuxezipobogafubow.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/17799999100.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/9346859762892aa9c4d9c89b8586e868/zumaxorazop.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/lidul.pdfIn PDF document text
    • http://atek-ent.com/upload/file/duzubifeganinij.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/kibebegazuwa.pdfIn PDF document text
    • http://doubletroubels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d3ec4ea4---91469128288.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160aa837e75433---24634016865.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/30ab0e2b67c6d35604b394c126ba741a/nodutikoxom.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/kaxutapar.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/09d715fe347061a994c2759b60513dcf/boduwamuzunebijajibeb.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/40163489976.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b95d02e7d---22425828250.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094bc5bbb501---xifimavex.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/87854137063.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715e99429d9---pikaraxorabekoridegoka.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a28a1e1976c---xitavowutinokeviba.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc7de6f5d---82761572922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=patience+and+time+tolstoyPDF 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_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 17868 bytes
SHA-256: 459943a0914ad34505c8f91a5931e1c1e73ba2538de09f5834bdcdde38be55b6
font_01_sfnt_off00011419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11419 10544 bytes
SHA-256: 3905aa15a90691b3efa4c08d4d8c1ef079acf5ae00f458f246a946d3bd702f49
font_02_sfnt_off00012c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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