Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb51c16f3e71578…

MALICIOUS

PDF

92.5 KB Created: 2021-07-03 17:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c16e2f51e5506b5c40366d8689115a5c SHA-1: b076ed1a3bb3a4de104096f01a52a81a09401dd8 SHA-256: 1fb51c16f3e71578a8fe28d815aca912a85b9d16f329429b7a7929b3b2cbceee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to external websites, many hosted on compromised WordPress installations, suggesting a link farm or redirection mechanism. The file's structure and embedded URLs indicate an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://pistant.ru/uplcv?utm_term=orthostatic+hypotension+bp PDF link annotation
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160768775066c9---laxepesarevunaju.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d0036536708c0d7689a07c0c2be125f6/bubesofej.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829ad062f88---xedarebizobo.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609778bb5c565---firemefoweziwu.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4795539fb9---93418920737.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/e006e70b29fa59e014a56eb725aafad4/10757995108.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/tutuvilufudibedunepiti.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/41228517099.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/9e884e03017c587a88b6a94598bcf352/wozetezafuzirip.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a76b5275b---ruvagufakiteb.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/35urion55ep6bll7dk7bn5okl0/74894624232.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2be71841aa---96038409878.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1d253e519---rotoxelukumuzepesar.pdfIn PDF document text
    • https://hiampelectric.com/wp-content/plugins/super-forms/uploads/php/files/78e85fe748710024d08c6cba2077a71e/92739730804.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/po3ijmtq96sb7k50uqd0920eoq/rowuturivaxo.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d0954262a---68887854227.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b741ade1ed1---50736201275.pdfIn PDF document text
    • http://angelofthewinds.net/ckfinder/userfiles/files/gipezezavolakaf.pdfIn PDF document text
    • http://fotobambagiotti.it/userfiles/files/50760239201.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31d5a1f00---palibetomateselilaju.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/vononumakiwijatijof.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097e5b1887ca---35814153272.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609209be179fd---78932848121.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 10704 bytes
SHA-256: 91cc26518c3fc87f34de36a25a6cb714dc8b708a15ca492a61b69cbb71084ddf
font_01_sfnt_off00012080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12080 17128 bytes
SHA-256: a72576b980bda6ae447330aa38f7b2d3776f8637e3a2496935c164a93d639713
font_02_sfnt_off00014d19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.