Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ba61a54b27cf7b…

MALICIOUS

PDF

97.8 KB Created: 2021-07-15 23:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 58b831ed42e10976b22004076c77d374 SHA-1: 1b46829ce937f1f626c8d73ef3fab26ff73830fa SHA-256: 77ba61a54b27cf7b94126fff21ff1de38571db761ac6d0bc94de224325aedede
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it functions as a link farm to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://irlanc.ru/uplcv?utm_term=tasbeeh+for+marriage PDF link annotation
    • http://dienlanhtruongson.com/upload/files/wulemepawemiduxuk.pdfIn PDF document text
    • http://vietsaovang.com/uploads/userfiles/file/94615135116.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/danujo.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/pusidisoravenanaruk.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73eaa7ce6e---bepipixa.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/af61a675ed298ec5e9256f0287374afd/11829529963.pdfIn PDF document text
    • http://novichiha.ru/pic/file/79620835133.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/5cb93ae47fdc97f1e59ea51a85847bea/78835830064.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/24932640033.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607078f98c63a---92143446013.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a74bff81aec---gipenanavufemowef.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/g7vmteu5mtth46f3vc78770k19/8790407772.pdfIn PDF document text
    • http://dsagco.com/Upload/file/90825740648.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d99e05bed---85044201876.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/57831540192.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/waxagukiv.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/puvilunobese.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/36340192988.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/21927682731.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf26bc928---rizejoxavotowofanimapazav.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/sojatemobejalarifosik.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/19410805809.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942ba188384---27832154820.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/74044040791.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160847973e8ed9---25604339442.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB87 10516 bytes
SHA-256: 4dff23967102d8231fc65b1cbe8e827de1cc5cd4c6f169e46f2cc45013333589
font_01_sfnt_off00011380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B92 17480 bytes
SHA-256: a12a58ef72f314174351bcda3545a558ddf6e749ea2f340802d0661bc5067cba
font_03_sfnt_off00015929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15929 19840 bytes
SHA-256: 82c222bce1ee9157124825d873bdcedc907a59ecba1ef9e05fe453d5b1e008b7

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