Malicious PDF — malware analysis report

Static analysis result for SHA-256 1077ba177e021e91…

MALICIOUS

PDF

87.2 KB Created: 2021-09-16 17:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0ad965afcdefd79df23ebd4b8347df67 SHA-1: a68fb673898566ed02d8acedffc8ac44a5726ea2 SHA-256: 1077ba177e021e91fba2f2f9388bf6d98faf2d2b5eec3828785aa86527a22d88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=how+to+find+saved+pictures+on+android+phone PDF link annotation
    • http://kirakuramenandsushi.com/uploads/files/47426281092.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/53170806843.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/56699468694.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/c3d9c3498fe0e72f5cbd2fa03166664d/91893976754.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/91798203300.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/vejowusenupekomul.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/gerolob.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141d5b38a57d---83411809557.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/98905839047.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210907_fbea3.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/42287873807.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/gugepikakokavofutumob.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/lezazetopalumup.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/52324681913.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d7b4e3fd4---41773609267.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/47600955619.pdfIn PDF document text
    • https://ceral.pl/ceral/pliki/file/40892393061.pdfIn PDF document text
    • http://holzweiss.at/3565614412.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/fovidaj.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134765c4ddb9---mazukuwisetuwojefi.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/wepakuzeb.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613677ee5c7e2---68501898876.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d7002d0e9---lifavawomalim.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/38876528958.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_off0000eff8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001080f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080F 10912 bytes
SHA-256: 866f6cf2b526fb2405ad143c71ea8603cb8b56b8c0b9674d4a8ae7c1f2bc7ce6
font_02_sfnt_off0001214a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214A 17556 bytes
SHA-256: f697c7745828d31d123fd4a218f58979d086de2ce3f0f0898cbcc845321007ee

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