Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd2c28cc520e822b…

MALICIOUS

PDF

81.8 KB Created: 2021-09-04 10:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bb5ee5acb2a6df34dc8d80c6a3332787 SHA-1: 19aa9d90ee47988253a8c152a05187e7e695e705 SHA-256: bd2c28cc520e822b49eeb8ffca59dae4fa611d37003dc1ba018ccb7856e5b780
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely exploiting PDF vulnerabilities to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=unashamed+book+pdf PDF link annotation
    • https://sardavetri.it/userfiles/file/56861632775.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/f9cb6bcdf701b8dbc1e23fe963096edc/texep.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/20567705253.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/bugitixaronekuriz.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16092b28693308---61050373501.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/lijemovomapajixinapuf.pdfIn PDF document text
    • https://hsse.cl/files/pesomenidadose.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/makufidukal.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/rulazejijole.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/56042055589.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160768bddb59d1---xifoxetileroramawozagaj.pdfIn PDF document text
    • http://ldksolar-officialliquidation.com/userfiles/files/73873006915.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/9300600112.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/dipawizidu.pdfIn PDF document text
    • http://www.siposferenc.hu/html/21824253476.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/76ccf436b19f65930386024d4a963cf4/28237107055.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/8401487655.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/polulukunokawozenover.pdfIn PDF document text
    • http://citty.org/images/uploads/file/kopesowad.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/88812458328.pdfIn PDF document text
    • http://etre-belle.su/images/file/nuzipawixagizaxi.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c958b82c969---fanepigutiviletudimizar.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/polaladuzuzu.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160820782d371e---64000630533.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/nuzejew.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_off0000d97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97C 18608 bytes
SHA-256: 1050c581a6ee5f10bb62e93cd50d3c2e889c0b468f8c6d95aa79b3b7fcaeb3ca
font_01_sfnt_off000109df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DF 10664 bytes
SHA-256: e5db1db9ae165a3089cca96c69c6912cd7d52111954fb07271799c3006a9703c
font_02_sfnt_off000121d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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