Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f767c123d3ef5a2…

MALICIOUS

PDF

77.7 KB Created: 2021-09-21 01:33:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: fd95bcf6570ab7d340f534a1ee97328d SHA-1: abceb73d5126178830b25d72d1ff7c69f8c3e9af SHA-256: 5f767c123d3ef5a2624c16c7300c046e5aae8d196108e4a9de6125631c3b4bf5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a visual download button lure further supports a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://laborke.ru/uplcv?utm_term=youtube+converter+video+apk PDF link annotation
    • http://fpempresa.cen.es/userfiles/files/70985639492.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/70943823159.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/fomesegegolulopalowi.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/476ae18dbb8bf2054a15c026ee063221/menasujatigupoton.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/33265221178.pdfIn PDF document text
    • http://3sdent.com/upload/files/50119461394.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/zinisurugi.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146dd9246721---wakerizadubebafivimuz.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/t86r5cvaci2onocfvcvn9pve3d/34050999720.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/18134764365.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/8576686583.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/86149585608.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/doxaxefamaruzutakotopag.pdfIn PDF document text
    • http://erfansari.ir/ckeditor/files/files/lolifukirifafa.pdfIn PDF document text
    • https://ra7a7p-h3ba7.com/contents/files/fivigixomamelipala.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/xoximozadesezoroneb.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/7577923495.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/nowogimotusetilek.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jegatejutojefedikobavi.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/dukesoverigogekivexifiji.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/18941606286.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_off0000cdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB7 10672 bytes
SHA-256: f0870becb9b16e89470adb4653918f303b04b6a52852d4137045c54b371c3b85
font_01_sfnt_off0000e61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2C 16608 bytes
SHA-256: 30918bd11b883b542187d84fab0dd43999b2c6c62d5c4f910439990932029792