Malicious PDF — malware analysis report

Static analysis result for SHA-256 7672ac44fadb803c…

MALICIOUS

PDF

85.2 KB Created: 2021-07-07 11:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a8a9b709b0a51319c16d89ace9f9b36a SHA-1: 5cfbaf4fa7312613a4485c2f44e5f1b0e9fdaab6 SHA-256: 7672ac44fadb803c12ae8026259b5d1399eb925f452dde74f2fa27fd468d44e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, many pointing to compromised CMS upload storage, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://coretry.ru/uplcv?utm_term=how+to+clean+rabbit+paws PDF link annotation
    • http://bethanybaptistcolumbus.org/clients/75549/File/rexev.pdfIn PDF document text
    • https://koreayokogawa.com/ckfinder/userfiles/files/jijap.pdfIn PDF document text
    • http://cfacgroupe.com/uploads/FCK_files/file/97204593537.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075bdfc693e4---jaxevi.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bc8abc740e1---46954259344.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/35781808563.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/48216927309.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/66917641909.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/95423506612.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/036e93258a20d0c9f20d4561457bfe83/megodev.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/tifip.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-2/20210502065933882775.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160e3029ef0694---nekafi.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3b490c619.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f20a47a573---revamuvozalikomusimepoka.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb521058a---47935034546.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609324ecb29fe---84366170448.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/49389992895.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb639ec43e---ronenikenekarali.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0ca10b072---mujivotujobusebazopuka.pdfIn PDF document text
    • http://vhktn.at/images/content/files/zifosilikewibalitu.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4241b6e56---luvoxofupob.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/22958434421.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_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 16840 bytes
SHA-256: a0d4bd653d7e8a91a282bd4f1443de45f7eae908651e6801c67d9f2eb646b278
font_01_sfnt_off0001177d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F94 10584 bytes
SHA-256: 7861025abedfe1bea59afbbd0055bf61887228a6ea9f21306d1ac4ad2b992fa7

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