Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afc3340255eed83…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 12:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b950488507e0c41afd7a5366db4ace0d SHA-1: b9d6bcf843195fc0e571c81ce10d549d3ac2e33a SHA-256: 9afc3340255eed830a8a649d9736154c93fcf067b6922846311ed5f130be4e23
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, some hosted on compromised CMS uploads and disposable domains. This pattern is commonly used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://accesoriosalmayor.com/images/userfiles/file/97125599880.pdf In PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b886cd297---teduligeposukokitebitadul.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/8996757875.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/jolusegijibunes.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/nowotepav.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612759c17644c---rafovow.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/0cf1de42cbe4ab354269d71f44227668/31482719239.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/mebefitinenexejatoloj.pdfIn PDF document text
    • https://phukienbep.net/media/files/bevarinedowazo.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/nitovinikilukupab.pdfIn PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/0f3b0bdaf8a33b403fd2e895d3346721/72984517730.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/16637418499.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9046d148ac---duvuligofiji.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd81c817ae---tenazikudorofebafafazap.pdfIn PDF document text
    • https://petek.biz/resimler/files/69549768860.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/gasajozemeranulor.pdfIn PDF document text
    • http://stpetersame.com/clients/9/91/91902b33218228c9a3691be2563b71f1/File/lesaporulileluto.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/f65aa1ae436ad55f574d66db8d03bed4/91289729275.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/24673909334.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/is36hdpbnr82qepqgsorbq2tgq/ropuku.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/safaxarunijamagure.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/078237bf27c5ae4d0f2d3e1256f2d9c6/42696181114.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/t95ef52atcqi3hkcmc074nkcu4/4921840275.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1ce0bf67---60006002355.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/jaxefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=advantages+and+disadvantages+of+electrochemical+cellsPDF 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_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 16516 bytes
SHA-256: fe1e705a0ecf4ea087956e48fed9625f2a33e2a5fc208727d30b5c3165d427ec
font_01_sfnt_off0000f219.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 10968 bytes
SHA-256: 866c6fa3d8112f5ffb46569d897cbc9ed4e838a200b493116f14dd39b61e2221
font_02_sfnt_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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