Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df220a3689896d6…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 04:48:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 992188f6d70f719c59edc04f8eb48f20 SHA-1: 9142840f80429cf852611ccd7fb25a2cffcc14b5 SHA-256: 9df220a3689896d6a0adcdcc8aa2a4362952869e984fed171159e1f2edf16012
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable domains. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161376d9a41046---votoxere.pdf In PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/36975157195.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/64834528650.pdfIn PDF document text
    • https://granitnet.hu/editor_up/kativa.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/73099472962.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/wejibuzerogogogalup.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/35126809695.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109041043301059.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/41321771684.pdfIn PDF document text
    • https://mfdesign.hu/files/file/xofumesopu.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/21200213002.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/23343441553.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16133260abcaab---58806988926.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/214113a703ed88e78ab20128064b2c77/tefiniw.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/28f7a75245dd0aae69a8db2e179f6a0e/labetivodemidigefu.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/manojubo.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/56603859003.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134e59ae437a---fimosowimabetawigetiji.pdfIn PDF document text
    • https://bak.vn/upload/files/64994023583.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/ruvobizivebapasetede.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/81151074266.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303d41e1c83---judofu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=minecraft+pocket+edition+apk+pc+windows+10PDF link annotation
    • 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_off0000c258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC258 10912 bytes
SHA-256: c0dc758bfa73fd74254b3df365615794d59365fe14957cc779bed18877fe2d7b
font_01_sfnt_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 17060 bytes
SHA-256: 10e8e1d4bee87d73fa75f98e42209661360094aeb39dc0637b9da0666a5b0b09
font_02_sfnt_off000107b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1