Malicious PDF — malware analysis report

Static analysis result for SHA-256 77a1e84c8b42eab2…

MALICIOUS

PDF

84.6 KB Created: 2021-07-18 13:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: e3558ee24ef0f8649bb71409dfa70c25 SHA-1: f8cc199c253dce2fbe980a34009a61239378ab78 SHA-256: 77a1e84c8b42eab25dc59c48dec3235641c820bb69010b54284842ecea1b3300
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable domains. These links likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/vf1r98hinn9fuabhs5kob2pc99/paberomilosuditerazinuko.pdf In PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adbc7899767---93131738493.pdfIn PDF document text
    • https://x-software.cz/data/file/80829414672.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/dto4iq09u2pcu9u8bvk76qmv73/4867205014.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/b185f4642d4e6c763c68bf5d579a8e95/30769345849.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/lizikukaliposisevuwivuxe.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/duvunasokera.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4a4357a2fe8359ad98dbb81ec2d62472/653867635.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/bumajinuxop.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16087a7b31fa89---86329477417.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073fcce90374---4151495027.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff453ea439---gatev.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a21803afc6e---32801297337.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16229233313116.pdfIn PDF document text
    • http://www.motorradfreunde-toggenburg.ch/up/files/mebulejowokamajozudelena.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799bb005567---91607677675.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/sigebozisur.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a234af626c1405cb12ab5f48ab666f3d/37815085329.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16087a9027c4f9---11788593176.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/29bc96ec9fca38581a865b761e0ee1fa/43521638552.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/46739689439.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/rnnqe50fpgg9gmf4cnimal0n8o/65065078627.pdfIn PDF document text
    • https://stadion-nsk.ru/ckfinder/userfiles/files/22824253426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=apology+accepted+meaningPDF 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_off0000e76a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76A 10684 bytes
SHA-256: 9208308a132058d0c4652c3c2fe20955b9bde507c358761612f90cf91d3bc0a2
font_01_sfnt_off0000ffba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBA 17352 bytes
SHA-256: 6f6910cc1fead90f2f2a2d4f71191764cbe73419863c06aaf1627f40256cdb59
font_02_sfnt_off00012d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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