Malicious PDF — malware analysis report

Static analysis result for SHA-256 082556df39be555d…

MALICIOUS

PDF

86.3 KB Created: 2021-07-03 12:16:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 6ed88f8378ab7cb4dfbb3aed63f91dbc SHA-1: bfa7620139fb66d41790d81247b21c8c0a49b49e SHA-256: 082556df39be555d1fc82b87efac262607d0d2163105ec83d02780211ef26a2a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm designed to lure users into clicking potentially harmful links. The presence of a visual download button further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://itineraire-consulting.com/ckfinder/userfiles/files/5229756242.pdf In PDF document text
    • https://toolsatool.com/userfiles/files/69642906186.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/bapelelidefafan.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/218b5444fda3143a0a38fc1232edf85b/56679373435.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-6-26/20210626135108133697.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d96520d4096---zabaxojetesunejujuli.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/sokekaxefiviru.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/59172158592.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fd9e61b5---96115373048.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/kipuromarasudidapabi.pdfIn PDF document text
    • https://dichvumayphoto.vn/webroot/img/files/29116319026.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/jrj3rbgarpfrvgrk47jeahqdp6/tilujeluwabipatas.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/lasuxeniwafa.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/dd31e5e330783a8cb8edd35521bfa865/mepinofewojan.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16088b62c0c7af---xebatubidujenogevofudimu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb648390c92---57736309262.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c06786fa---27448292888.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/klqvqpk68d8e9fbnc0glid47e5/20894526982.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/95008705823.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cceffbb2a2---27644790194.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210513/file/47627066505.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/jm6ns3u90ao3ioo43u13s15fsq/12992148256.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/4e6cf8f07283ecac3cef3079dc118e35/wafigazalakujogekofunire.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=youngest+age+of+consentPDF 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_off0000f083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001089a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089A 10356 bytes
SHA-256: 149b7aef97eb257b219eac87e28cb996395e81b79e19e9d944f91843d17e7037
font_02_sfnt_off00012039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12039 16924 bytes
SHA-256: caff08363ece4de956cf2780e8d38eaab7681a5d7aa6cb7f46be574e1b8167ba