Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7ce23cfdb303df…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 19:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f4e0db483911fcfa8b3fd3af87f6a1f6 SHA-1: 42c84f558785abec25cdcb70dc00c83e8ed440ee SHA-256: 5f7ce23cfdb303df5d6771791e5a888d22de8375d9cb473fcd3af9b16f3a83f9
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to distribute further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to act as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://billionbosses.com/ckfinder/userfiles/files/98453435405.pdf In PDF document text
    • https://angkortaxiservice.com/userfiles/file/xenelesomoviwinixugoj.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/f12f0e3e48d42fb26c89e5b9205d5745/9949260202.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/37189e2fbbc039553ba1fd962fb95442/5286441425.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/378be53b974bc87fcb744f410ba9014d/gobekoleteniwibalep.pdfIn PDF document text
    • https://people11people.gr/uploads/File/89866178987.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c408c524e8---baxuwilawesaxozulamowas.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/jagama.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160752900d0f13---doteroxivob.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/35131675938.pdfIn PDF document text
    • http://edeins.com/userfiles/file/34363537551.pdfIn PDF document text
    • https://inwestorfinanse.pl/userfiles/file/34921076332.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/taxukupaw.pdfIn PDF document text
    • http://amandamaitland.com/images/file/12019409454.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4c6e7b5fde---36145326327.pdfIn PDF document text
    • https://csodamalom.hu/files/files/podakigajezufizekebosukel.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/77291535651.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082896b7722e---bigeganisojulipatanirofos.pdfIn PDF document text
    • http://sns.hu/_user/file/69164451129.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/lozubi.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents//files/foxaparesisibapujovekager.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/63098531488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=converting+fractions+to+decimals+6th+grade+worksheetPDF 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_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 11368 bytes
SHA-256: a4e1f43068abf3fabb60a7a6e180722cfb25caddf9daf93e561df4cfa236ad2f
font_01_sfnt_off0000eda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA1 18444 bytes
SHA-256: 06fab7b670352c9b154c843323d0cbcb121ad083c3e51061a69f9e61cc708819
font_02_sfnt_off00011d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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