Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a0d7c4bf97eb7b4…

MALICIOUS

PDF

88.7 KB Created: 2021-08-23 11:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4b54e5d87725feb5bfbbc382b7e1d67c SHA-1: c261134f89191e78c099dfd951067881c2c032ec SHA-256: 6a0d7c4bf97eb7b4ffd96419ce8798053ae0e77805ec6dd731c5e567959cbf0e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

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 http://cleangroupbd.com/ck/upload/files/nogagolaniveluniz.pdf In PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/46998691667.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/wunajoxewumemotex.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082a32032c11---60986365255.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/jawepipazotenozodoxirusu.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/160acd7eb8eb65---rapadiwisijo.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74129b27a9---paninenokegipirup.pdfIn PDF document text
    • https://citytrafik.nu/images/file/bowevesuxodij.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/27775679931.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161127a8fb957b---33805981173.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/baf4ffd97a7bd05a887580c050c3b70a/295314185.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/fa184d8664065e4ca5ee0d22011548f5/70646479673.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/3e665fdf167e3b051647b041801b487f/11919867551.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/beguxonik.pdfIn PDF document text
    • https://alpinashop.bg/files/22622957329.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/49997332937.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/bimemukalenapobiw.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/5c514765def89ebff95bf4c6e946db3b/15922886651.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c03e5bd1f---sajosofixujazegafi.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/lefen.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/53717958180.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbe3f9704dc---kutubamorabaro.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f69f00994---30551201334.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/0f011dc9d166f8d0981e00bb2e6b0195/71306182773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=why+is+jean+michel+basquiat+famousPDF 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_off0000f681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF681 17312 bytes
SHA-256: c8ac5ea60de295d2de82682a2c51df86c96da7ea4b67c40c1fbefbf2dd6232e6
font_01_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 11124 bytes
SHA-256: 497b13beae24a52f851b612c548da6fb2c79fabb2ba3b0b9e6746f296dba315c
font_02_sfnt_off00013cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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