Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d4d39f969b5c81…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 22:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 7a4b56d360876a969f84611ef6048aa3 SHA-1: 0779c8dd82fe37591d585d84388ba304728ae84c SHA-256: d9d4d39f969b5c81e1d5053d0b784aef608de282b51fe21165323edb4350416f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=how+can+i+facetime+someone+with+an+android PDF link annotation
    • http://vnationwide.com/userfiles/files/84124794360.pdfIn PDF document text
    • http://vpsystem.com/files/fck/didogunerajamedod.pdfIn PDF document text
    • http://gurgaontaxi.com/pa/trainstation/uploads/image/file/vopiteda.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/mabubumidozuguvorewave.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/21168481012.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135322f9bd73---favezuduw.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/2ace3f546141f8742a4be97130c16492/51045508302.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/debudumegen.pdfIn PDF document text
    • http://rcot.by/pics/files/33675909705.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161475f36d962c---vodevujabazureno.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/wiweg.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/292bc77100054fafc41a80b05579de0c/40688195321.pdfIn PDF document text
    • http://chinazzjx.com/d/files/32703625871.pdfIn PDF document text
    • http://dbexpertise.fr/catalogue_dynamique/file/98070100804.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/getunubatatenovavun.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/wubudidumobezapes.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/38652151810.pdfIn PDF document text
    • http://topp.pl/_topp/file/92846743136.pdfIn PDF document text
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/babux.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/nilebedokij.pdfIn PDF document text
    • http://asfalon.com/__files/file/wirepasutiwuvepewegiti.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/76463488864.pdfIn PDF document text
    • http://industrialdevices.in/uploads/padananazovirisojobijunob.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_off0000d4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AC 10772 bytes
SHA-256: 8a3ee1ef6cbefe7704ce3360e651ec32520aaf2e9824abc259b121db36d30e91
font_01_sfnt_off0000ed48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED48 18444 bytes
SHA-256: 4006aa03ff23568335273e404feafc3aa325e6e7e0df248a13abce586e8a9e25
font_02_sfnt_off00011d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1