Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cf4671265137b5c…

MALICIOUS

PDF

77.3 KB Created: 2021-09-03 21:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: bb5742098911ad1c785314fa667e196e SHA-1: ff5c4855db65e1c99005e390f336581a1086707d SHA-256: 6cf4671265137b5cfa97cb89cf4b70b2f745ef07a0b660526e4348a9c66de15f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of link farms hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious sites. The presence of embedded JavaScript suggests an attempt to exploit PDF vulnerabilities or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=deployment+diagram+for+online+shopping+system+pdf PDF link annotation
    • http://dakmoto.cz/obrazky/file/dopuzutedigelavepoz.pdfIn PDF document text
    • https://khyatiinfotech.biz/ckfinder/userfiles/files/nasemabukejolinafetaroza.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/vewejuvid.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/texus.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/69316878884.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/nuxuvixakif.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/97127369280.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/jozepopedok.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/f37ejlmimehjt1l3t6dl3pco8e/paxadejomuxiz.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/94644860647.pdfIn PDF document text
    • http://rowanfamilyreunion.com/clients/28915/File/51795433514.pdfIn PDF document text
    • http://rts-3.ru/upload/files/kimuzewudeg.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5cd617910d---22907597184.pdfIn PDF document text
    • http://darec.sk/files/files/47289947849.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6bb939793a---nuvaselarajojatasoxawe.pdfIn PDF document text
    • http://pchs1967.com/clients/b/b3/b38b0c0be7ceca4b309dcb684d78a7c5/File/kuxapesufanugedawobat.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/peketosi.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/5803745ff15361f213045189ebd21879/gaxamenesavutodezekofatoj.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfd9eca195---66344408187.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/ae9bab789c8c46a3b3f2a92cac59f773/basozokidobawiborunet.pdfIn PDF document text
    • https://digireg.es/upload/44055447846.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_off0000c93e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93E 11060 bytes
SHA-256: 5a0fcc2ee70bcdd663a59b6b4a589a4a9bfba1a07e8fd87b19dbe0752e6c7261
font_01_sfnt_off0000e291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE291 17376 bytes
SHA-256: fb7c76e97b24faee1e3706001ae8b4fcf893ca8d61b975bc5c280a8e7c8a1177
font_02_sfnt_off00010fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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