Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db73c19b86f3f87…

MALICIOUS

PDF

91.2 KB Created: 2021-09-05 11:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c8d3ef3684462c9e85ea7b5dabee8584 SHA-1: a6728ccd600080be16739af8c0c4e17cb7c93b4e SHA-256: 0db73c19b86f3f87bbbffcc511ad362d9aec88ea5e4c4b7fd604d267a6551d6a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to various URLs that likely host malicious content or facilitate further compromise. The document's structure and embedded links suggest an attempt to deceive users into interacting with malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://philabc.ru/uplcv?utm_term=eftps+business+phone+worksheet+pdf PDF link annotation
    • http://euro-ex.com/images/blog/file/26520290610.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/bovoferanimapuxobis.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1607544f7d96d4---47854115230.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/d620n5ciqv1mj8vugladt62414/siferozebubidakuduriz.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/47675303637.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c34db8a4f---xirenivolin.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/vebagabog.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/povodumujafi.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/cf19eb4be024a3b76ccd54075128ca28/nixivulizaxuxudefikeluk.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608c29db2e845---2825025348.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ba61287d8---fiwubokezerosibofad.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/bemis.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/5863095314.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160982f0e44c37---domokinugex.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/wisuvupos.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/80395283199.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16076f30e9918c---riril.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/3tt0o7h08u0nl9huv3dnmgsg30/wavezidod.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/45609669556.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/d3b68a3c59552f931f1aa4636e974947/76269157123.pdfIn PDF document text
    • http://savemaxint.com/files/file/21182836938.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/kekazevufenesuvirema.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/68818616798.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_off00010139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 10788 bytes
SHA-256: 94b59ed73184384116d680522b022f5d2b11d70cfd7ba7bf9e8359e9a352c4ac
font_01_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F0 17752 bytes
SHA-256: b38243a02a299143c56d6ad59fdd251c4005fe7b60206620bd0e1f2d2aaca5e4

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