Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79fb7350ee47e95…

MALICIOUS

PDF

109.2 KB Created: 2021-07-07 02:18:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8fe5ed93253dfb734f2d9e703798cadb SHA-1: 1f6970d43f852b820f1afe7549d9e1f53759cc5d SHA-256: b79fb7350ee47e95f95127a0db3cf73edd8e7bbd3edef709a04f9e4c313a2a64
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised WordPress sites, suggesting it functions as a link farm for phishing or malware distribution. The presence of external URIs and link farms on disposable hosting further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9797

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://smidgel.ru/uplcv?utm_term=the+magician%27s+nephew+study+guide+pdf PDF link annotation
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a3805adcf---91828767712.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/073a60d85a281be5f322fe26a78aab18/64275781901.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607178524d7da---lixiwemezijelawufunexeg.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/1ef59ism7m43kl0dvmhbndj2a7/19817067825.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086676314dde---41570340948.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v82mlh86gt54bjns7ctkag21n4/gezolawax.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/16ii2h32sa82aggsp42ftf9p87/sitamezeguki.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4c8373b73c---66778229298.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/0104cebe8d095d710bde3fa8ebf5c2b8/28619671945.pdfIn PDF document text
    • http://haumeaonline.com/userfiles/file/1007040274.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/c3b18dc1b2b90a71a01f4abca022141d/fifewatemubokudojukogiz.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/b6ea7951d707dcb992a2f72be29bb295/21171332387.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b50ae78728e---pataf.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kd48lg4jaqev3hpckphsqv15ci/38426513907.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/c43b0391488b60ca16f0377f041d4bcd/nikobekekividave.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/34221070205.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609253bde3b3d---96026531584.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/79125882062.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/63642709014.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8702c40014adc4a32de1044e40cf7112/jelirukazojopetob.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9a8ed9699---bimewi.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e4d3dcc1ac7---butefepajozo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160884644b9f19---97879475692.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/1090402f58f0f2d0fabb34a5bdb4593a/pularidonukelotubufomoxir.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/sidepasit.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/2154c9879e82e3211463f0d0c472be9a/fabubeketuxibena.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_off00014674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14674 11100 bytes
SHA-256: ced1ae2c29d8ab9b3c82280e3eb82aba400020a26d4e1a581ff47479425f664f
font_01_sfnt_off0001600e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1600E 17300 bytes
SHA-256: 65599f6dcbb836372fa53b411a923111e05802c215986db3020defa18f21f09a
font_02_sfnt_off00018d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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