Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c832883f3506479…

MALICIOUS

PDF

80.3 KB Created: 2021-09-21 05:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 557ab0cdfdec60f257ad21298ca824d2 SHA-1: 4382e9d127c5cb174b95af92f1545a91c8c6e33a SHA-256: 9c832883f3506479a98e67e8d615279b40bb61327d1ca55602b5fda54dd257dd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to distribute malware. The presence of a 'download button' heuristic and a high ML classifier score further support malicious intent. The primary URL, https://philabc.ru/uplcv?utm_term=dragon+ball+battle+apk, is likely used to redirect users to a malicious download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://philabc.ru/uplcv?utm_term=dragon+ball+battle+apk PDF link annotation
    • https://rmduncanrealty.com/userfiles/files/59555024882.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161401ab93682c---87475611360.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/fefekal.pdfIn PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/lasamowudaraxojojeliladu.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/15116185463.pdfIn PDF document text
    • http://kbfrutos.sk/images/_file/jiwopixosutozorinan.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/bisegufi.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/kefiguvuwivatitelumo.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/bugipufuwanex.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/putuwawi.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/xumewumanefonow.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/kujujotakaxam.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5b8f84871---67429072411.pdfIn PDF document text
    • http://studiofapas.it/userfiles/files/penivunuxelevofuvokewoka.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/tegoxixolizunexelul.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d6a7254a8---20341060617.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/bonefamupidajunitijufim.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/58712477964.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/76457977734.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210919_47311CDFC41A4473.pdfIn PDF document text
    • http://htygroup.com/upload/files/62286375209.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf174ea28c---jaluzadenarolefazupovaba.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/96055009552.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/5325922025.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_off0000d566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 10400 bytes
SHA-256: 94688b659ea467d1453154ad55ba57e44bc08fd74e4d90302bf0f6e94e6a05db
font_02_sfnt_off000104ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104EA 17964 bytes
SHA-256: 0eb4d39a36cf7534fa9ee594114dc05ada5f7c6c9b89240258598980b6dfb358