Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e6f3cd32c1c697…

MALICIOUS

PDF

85.6 KB Created: 2021-06-30 12:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3d056779871e2e1bc7afcf192bc11d36 SHA-1: 6a2e1b5564b1f85fe61fb37989eaa0d28379dcd2 SHA-256: a6e6f3cd32c1c697353d34112c40b5c6c6a31f39dd1a21b7177f0e2c9d9bb6cc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of external links, many pointing to potentially compromised or disposable hosting, indicating a link farm or redirection strategy. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://amazingindiaphotos.com/amazingindiaphotos//upload/fckimage/file/75620773158.pdf In PDF document text
    • https://zabulgaria.org/userfiles/file/30288697545.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/96977651550.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/41732598525.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/2162922365.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/kejalube.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/54465270896.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbcc4d68f34---76624939461.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/21697036853.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/nirogikeloloniravimoku.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aba04aa30eb---kuwuwulirinokulewevaxi.pdfIn PDF document text
    • http://preserveproperties.com/userfiles/files/juwudowinuwoxak.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/baramidobugurirerinosum.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093ccc78e01b---lulelupujeb.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d6715194---63896671580.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac75e40a8ce---miwireviraxuwud.pdfIn PDF document text
    • http://anaminfo.com/attachfile/file/divof.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62b262189---7203238380.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c12ea2024a594da702bf199d837c5d6e/nubixewokagepevakebabo.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf0f16085f---gogiwupikazituwikuzuxen.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d59e4855617d6be9bda4f6eb0db006f4/91558884284.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16087ddd2adc96---wogebu.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160865805ae5ad---82830688440.pdfIn PDF document text
    • http://anma.pl/anma_edytor/file/sipatiku.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/800d1dc5d137fad53f3d537fe82bf00f/rejipefatatevowukux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+center+for+the+study+of+new+testament+manuscriptsPDF 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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 11104 bytes
SHA-256: b7373d2bc8403a1fc7019fb920137ed094f182f8c17ad387bd983db40340aa34
font_01_sfnt_off00010457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10457 17052 bytes
SHA-256: 959e6f9ee37a3391e98cdeb3aba666f0cd08e88411fcaf9c6a56809333541d49
font_02_sfnt_off000130b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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