Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb092747901d4a90…

MALICIOUS

PDF

77.5 KB Created: 2021-09-19 10:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 658fd56af67e8805fad781305808266b SHA-1: ad179f8261da2a4be1ddf41a9a293b892e10ad4f SHA-256: cb092747901d4a9006d8ed052d2b98319c426953deacb4135c03446bc55c96ef
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs, including one pointing to an IP address, supports the attack pattern of redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://autosoftware.company/autoresponders_images/files/tefixo.pdf In PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/fokobunakinolodexunijogav.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210904_093208.pdfPDF link annotation
    • http://orthodoxvaidikasanghom.org/userfiles/file/30575114619.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/6647930228.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/wategivawegemibop.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/daxovor.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/rezituxekitifuve.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/35567108009.pdfIn PDF document text
    • http://zuche0551.com/upload/file/1641522133.pdfIn PDF document text
    • https://jdsliquorlocker.com/nbloom/fckuploads/file/44436385786.pdfIn PDF document text
    • https://faguaflowers.com/images/admin/file/notule.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/98926309717.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/30056698019.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/42401589427.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/nulavuwolofuxaji.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/20905c03df66a63baf86bccd8abc34eb/penomopibudobujerudadu.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/161392fa940983---visevaj.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210902105917.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/69718762729.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b01f489015---56777375154.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/23456165464.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/xakatisafalox.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/62769981253.pdfIn PDF document text
    • http://netart.hu/userfiles/file/tusuxeloreletabusezipebu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=catmouse+apk+for+pcPDF 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_off0000c98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A1 17956 bytes
SHA-256: d19c345536f0bd98b85479830d115093adb2c7aae2fd33d6a01b890e6f75c32d
font_02_sfnt_off00011011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11011 10620 bytes
SHA-256: b1db78535ab269a6ffc3ebaf5287d990fb3c2cb15f13c7b03d030830b191d6b7