Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cc847e8619d045d…

MALICIOUS

PDF

75.7 KB Created: 2021-10-04 04:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9d1596683740992ab21d6e1486bc7ce7 SHA-1: 6cd197a34f3803d63fd6e573dd39604c7861ea3d SHA-256: 4cc847e8619d045de94863d13ca8a981b8e9c057a2d24c9ba13010e6a53f0c7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://securitydm.rs/slicice/file/98032333857.pdf In PDF document text
    • http://geodavidepini.it/userfiles/files/jivavujopuj.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/40032443313.pdfIn PDF document text
    • http://stefani.cz/fck/file/96762583743.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hia54a4n3pco7o2ot39mugrq50/78325968109.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/4991341377.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210914140540.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/12249196843.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16138a3bd96f88---kitunuwubojisus.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/41346000489.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/gasizawaresi.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/83564252414.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/36117988028.pdfIn PDF document text
    • http://hnhappiness.com/d/files/naxadegavolazefukakolute.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/24857152784.pdfIn PDF document text
    • http://sutipatika.hu/userfiles/files/45792812930.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/zejikatunezis.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/gozajagotoronapi.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/pogirixajijufimu.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/woferuxefaxusuzikopug.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16152674030f55---putisipidaxugifaxeti.pdfIn PDF document text
    • http://nanopena.cz/upload/file/90023198464.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=lalo+schifrin+all+for+the+love+of+sunshinePDF 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_off0000bfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E3 18520 bytes
SHA-256: 2687c7151e776f0176128b68ba10c3b2a1e4982208ba60a8046addf280e30c24
font_02_sfnt_off0001089d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089D 10556 bytes
SHA-256: 3b6fdd84ef5ff1ea6f3f5748be6120db4429b11a857e075b78a87a5cae3ac55c