Malicious PDF — malware analysis report

Static analysis result for SHA-256 71eb3bcf18180b30…

MALICIOUS

PDF

83.8 KB Created: 2021-06-28 11:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 43573837fe6cfe40d82f93634dbeda55 SHA-1: 0e02c4194426d22c185a10dac6087b632e24caec SHA-256: 71eb3bcf18180b30715e03837c022051db97d6f6fdf679cc19b3dfb9ecdcd85a
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF document contains multiple links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The 'SE_CLICKFIX' heuristic indicates the document likely instructs the user to execute a command, a common social engineering tactic to bypass security measures. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://synerhu.ru/uplcv?utm_term=unable+to+view+pdf+files PDF link annotation
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/fba6bf69c44a8e4a099031e0a168cc1b/xivafotoxisepelurubovi.pdfIn PDF document text
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/8dc22b2ea37f95ea2cb799c3a9ec7481/jitelek.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608797d8d2261---vulagusapiwadogodu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/nai77otf64nb63l8sha7gojuf3/fidazi.pdfIn PDF document text
    • http://huiking.cn/uploads/file/211356169121.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b0956c5a651---nupefubabosapi.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2096b39ac---zonigir.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/69269f77e6415c32cb99bfabd47fb1a5/23912438764.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/tibadipafar.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/37de2c9f104d6f44d3cb52343d633089/vibiwubovawodefapo.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/xewukur.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jejupebileje.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc45ad142a---kudimitivuweden.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca9063f0e0---zuboxadutifuxap.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/tumijegotetubul.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b966a1f231d---94652533569.pdfIn PDF document text
    • https://mfdesign.hu/files/file/dutakevemalutetijoxas.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b567c9adc---fupuvefefi.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c647925a7---gakegokusivezewepabanup.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd41bc5534---favisiwunadaxesomasetikaw.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/70292289029.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_off0000e59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59B 10688 bytes
SHA-256: 860555c8fee746380fc6e916c3d2fe3a8ad584ebd04355886c5160446bc3ac00
font_01_sfnt_off0000fe17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11629 16992 bytes
SHA-256: 568fb0a18e32b69a9ac9932457445f478af7282d0444680c8eb4dedf1a375046

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