Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b2bd9c62834d1c…

MALICIOUS

PDF

87.5 KB Created: 2021-07-23 08:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: da307ece14c145b9c6e456c64dae2ba0 SHA-1: 296e7df61baa45575d624c37350e5b30cd92b735 SHA-256: a8b2bd9c62834d1c25b88df7aef34f7d1f2aa92a67aaf0c02349f84ce92bee66
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites and other disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of numerous embedded URLs indicates a strong intent to redirect the user to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/90d0fd80a04abf8e4329d1cedda70b0f/zuzadufu.pdf In PDF document text
    • https://birudongker.com/contents//files/99396199632.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/gikefosufo.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3bf5e2688f1ff4da357885fcfe722279/42967737512.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/jubujejasufen.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/tsn05n03ht8dc4avvvhfc67cub/zusepekerobalipowajadezo.pdfIn PDF document text
    • http://mbcasc.net/imgs/file/74788879341.pdfIn PDF document text
    • https://fultoys.com/userfiles/likazabijez.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b73dc50c2---zegikobizivifi.pdfIn PDF document text
    • http://shssailors1969.com/clients/3/36/366f78b21138e0f8005dfe6cc5e09e30/File/gibusot.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/burasusumakemov.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/wenokagunavadukawofelu.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b8b68d17b---wavemazurafafowojivoxiz.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/i2fmvtjglivh3259gdfgf5ao8o/rurefufinumonevugurumu.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/xabirupotowev.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210610034757139.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/14400066823.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/e860790306a3c88d8fbba2513a186f68/79350423058.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/48412139077.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/vojuzupozozam.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/8vscknihls1ntquv3ubatpmck4/pamagakivajugi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zuxot.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/4acd13a6e8994cbdcbabaf076d32ccf3/xodisenojilufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=counting+descent+pdfPDF 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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 17268 bytes
SHA-256: 177eb2c12b8872b3f6de326a570f5266bb176e192ba311e8a7ceeb9f6b9fc7d6
font_01_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 10616 bytes
SHA-256: 1f05274cfaf5fcc09b9a5710183e2e49570665558545e8a1b97c9a7d6d51d4b4
font_02_sfnt_off000137ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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