Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7cb0035b07755e…

MALICIOUS

PDF

77.9 KB Created: 2021-09-08 05:59:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a3caf69c5c746d8a0ff89cb61419fb5a SHA-1: e091fe244a406f4db911dc2170b7451fa0075470 SHA-256: cb7cb0035b07755eccd9d36d7c95d0716bbbb3a2207ca4308c9e1d03c25c48dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=extrasistole+auricular+y+ventricular+pdf PDF link annotation
    • https://wodepcb.cn/uploadfiles/files/62038889377.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/dc6eef3ac9ca29ed7382046550f6f40e/77356894792.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3145d2aa3---bubetuwijabedixez.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/pizizapawobibuvepuf.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076dab9c57f2---satuzexuvogajurumoxoxa.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16111e16057a69---66679527476.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/29582371874.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/388ca7cc716564590aa7f879e6ea7e8e/didepebuw.pdfIn PDF document text
    • http://ratchadatitan.com/UserFiles/File/19498519061.pdfIn PDF document text
    • http://myexamadvisor.com/fck_uploads/files/wisevowi.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/73921544320.pdfIn PDF document text
    • http://hilimall.ae/uploads/files/39734149936.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ftuinv0frut8g06bui1vifkrvo/jebevajotaniguveviwizesob.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/ds23edig8hgjs982vl4961o1ut/33470729438.pdfIn PDF document text
    • https://asiapharma.la/files/files/somofexowugisixomigonufa.pdfIn PDF document text
    • https://cmoretv.com/userfiles/jineg.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/xerotum.pdfIn PDF document text
    • http://whs1979.net/clients/65916/File/92989568457.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/gezibubironapiko.pdfIn PDF document text
    • https://airbays.com/userfiles/file/wowoxofexasilanarebodu.pdfIn PDF document text
    • http://marienoellebermond.com/img/uploaded/file/55958592266.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00d15a4f22---82573814227.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_off0000c995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AC 10980 bytes
SHA-256: 1f521a27969210518b3a6b9d36c693b286010c3f449ca5e79234033d9ea2ce4e
font_02_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 18392 bytes
SHA-256: df9cb4b327ada130b6317d64b5fcf8a673eed7edefa08c6184e2df3072f1b353

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