Malicious PDF — malware analysis report

Static analysis result for SHA-256 0271525dc5f039ec…

MALICIOUS

PDF

78.6 KB Created: 2021-09-17 00:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f1de3ddd1c5d4b7371c2a5f5bb989cbf SHA-1: 5f4a89a1d5b9a7d6104fc35c09c47393a3cc5c98 SHA-256: 0271525dc5f039ec3222410c756fc6d144db09597f6c7b92d101f67a3161bdc6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://archism.ru/uplcv?utm_term=survival+on+raft+crafting+in+the+ocean+mod+apk+versi+terbaru PDF link annotation
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f05350326---62305419337.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/65660159273.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/62759932894.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/xoruzezumawexijojajuwola.pdfIn PDF document text
    • http://contelex.it/userfiles/files/64481049428.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/vusabifemexamijixaxare.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/zagawokugat.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/2bf01de77d0cfb4176ba3db90e212366/kenoxavikekibof.pdfIn PDF document text
    • http://cartopack.be/Images/file/30263687633.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/sofevujagigeval.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/mevofedelatufasimonutesam.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161367fd7ecb56---42810578846.pdfIn PDF document text
    • http://cartopack.com/Images/file/68432925697.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/6650924006.pdfIn PDF document text
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/piwogaguzoduxoji.pdfIn PDF document text
    • http://cgmorenanews.com.br/ckfinder/userfiles/files/29110532357.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/58961283397.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/12701867847.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/fatiwifetulunoxurer.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/49409943342.pdfIn PDF document text
    • http://axwelindia.com/uploads/39790354273.pdfIn PDF document text
    • http://wjcopy.com/upload/files/kolivuzigak.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/sojukubolojawiburele.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_off0000cc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC6E 11540 bytes
SHA-256: 45bff197683681c01aa8c2181bae493d4a1659d6f25afffc9e3a7f3c90723fd6
font_01_sfnt_off0000e72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF41 17304 bytes
SHA-256: e7537fd66d34e9548122841598cf422c5b0864c8695e993b3f125da5255900a5