Malicious PDF — malware analysis report

Static analysis result for SHA-256 72d16e03d8eaac5e…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 05:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0a865dec64cf5c42241f0d9c01855e07 SHA-1: cecc087983a3f68a146aff493768de50bedacb4e SHA-256: 72d16e03d8eaac5e087b73b5c51b9dae2618755d13d8cd1eab8a53d22845f9f0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which appear to be disposable or compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of 'utm_term' in one URL suggests a potential tracking mechanism for malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=ccleaner+pro+apk+mod PDF link annotation
    • http://kite-surf.sk/files/geraraweneredavofet.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/bimofonugeburib.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/rubopovarabuzokisaxeneve.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f8745957e---pigijotuwizikebixifuzije.pdfIn PDF document text
    • http://leeandrewdavison.com/download/duvolep.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/juzogasof.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/gunanisewogip.pdfIn PDF document text
    • http://debten.net/UserFiles/File/jodevudumedu.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/c11bef484d472647bd7a0a0bfae85a9f/42603077327.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/goledumexadepuresajolopo.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-16/20210916035243683453.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/bawalikapelupiwoxurim.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/80393868222.pdfIn PDF document text
    • http://c-amc.com/upload/files/foxogupotijelix.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/90581312486.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaf544fee8---23093362711.pdfIn PDF document text
    • http://zhxndl.com/uploadfiles/files/josuvilovezojazasosop.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/161450e19b8178---1478304652.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/lovavojoditoza.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/72469721759.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/dijelake.pdfIn PDF document text
    • http://nguoiquangphianam.com/uploads/files/51217208932.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_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 17576 bytes
SHA-256: 8fc66b8ec7832badb15cde1a06b29365cafbc76575a573b3111c25e325a44a85
font_01_sfnt_off00010ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 10440 bytes
SHA-256: 7ba0d2b59eb47deca24bbb6ec48faddccdb5cf9c291c4213851ddf98a20cc16e