Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aa5b96a41fcf314…

MALICIOUS

PDF

103.0 KB Created: 2021-06-27 22:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 855abda0943ed33a2a4928bcac3a048c SHA-1: 93bc4f27b4bf8bf501dcdbcecc355915e1ad8ec0 SHA-256: 7aa5b96a41fcf314cee202532e54d41cc804d66e556aa6f3be8a6f082baa20c4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is a link farm, likely intended to redirect users to malicious sites or for SEO manipulation. The embedded JavaScript suggests an attempt to execute code, potentially to download further payloads or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nomylo.ru/uplcv?utm_term=sickle+cell+anemia+blood+transfusion PDF link annotation
    • http://brilspa.ro/userfiles/file///vofalitetedamadotuza.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a346be2173---58219872529.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/33216709729.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/70942096825.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/faxijesovoni.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607def83f22e3---novodixexo.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202106231823.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7cd9558b4c11244555d65489f49bd60e/96648019968.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16071b0d36a7da---vazuzapezofuwepipofit.pdfIn PDF document text
    • http://wenxuezj.com/images/File/884512329.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7894405d4e3986866671a5b046ee99ac/tuwejimesuwinemito.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/gowowuvikotuv.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/94570652740.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/5r5v8eoeirqh4em00i16lpqk6i/vuletumo.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b81eeda2ecf---42768922659.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/44e0fa7bf5de59f1c9dcfa8621576c4c/refiwirikapod.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d358059ab1---24727215340.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079480412061---60211879159.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee1ec74a8b---93885144568.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210528090856.pdfIn PDF document text
    • https://www.lightingdynamics.com/wp-content/plugins/super-forms/uploads/php/files/366f2704e367b7f99ac840c9a7df7504/90579125585.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_off000132e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E0 11044 bytes
SHA-256: 808bf008119d7911ad8290cf67b38b9a02d592cad6aba36467d4f41e24685a60
font_01_sfnt_off00014c8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8B 16352 bytes
SHA-256: d3ac2f6b6ea7620757421cc29f5c2d3c2ed5cdba5acbb38e61798853f9e8f0e4
font_02_sfnt_off000176d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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