Malicious PDF — malware analysis report

Static analysis result for SHA-256 703214c02b46ca16…

MALICIOUS

PDF

70.9 KB Created: 2021-09-18 21:22:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8bb226e4399a37458b1c1d21f000879e SHA-1: cb8f932aeda669881e1f9fc49a2e40f96f1b203f SHA-256: 703214c02b46ca1695c718edaaa6278cf99f7b070d43bf3ce6cdc3ffdfb0412e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, detecting it as a phishing trojan. Static analysis revealed numerous embedded URLs pointing to various domains, many of which appear to be part of link farms or hosted on compromised sites. The presence of these links suggests the PDF is intended to redirect users to malicious websites, likely for phishing or to download further malware.

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://catamma.ru/uplcv?utm_term=letters+copy+and+paste PDF link annotation
    • http://media-production.net/admin/ckfinder/userfiles/files/50250758478.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613dc4c292308---85222411943.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/82889001889.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/semunibanoputere.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/xakexova.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/nilamekozodukaregafuk.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/812894867.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613878c60ed27---rujazu.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161365c8be5e7e---mixabumudetisomofikisa.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/36784093172.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/10788771481.pdfIn PDF document text
    • https://inprovit.com/ckfinder/userfiles/files/63166629125.pdfIn PDF document text
    • http://budropol.de/Upload/file/82779515903.pdfIn PDF document text
    • http://leprofit.ee/cmsfile/contentfiles/fapobenadugo.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/85048544341.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161435b48262ff---gagazujufugefiwubeka.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/gobujesaburapojur.pdfIn PDF document text
    • http://yalcinsezer.com/upload/ckfinder/files/90487528951.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/lugowaxumi.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/78886719447.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/33421543999.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/gagokebumolizifagufi.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/wekukonokegowovimov.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_off0000b6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6AC 15388 bytes
SHA-256: 2d15a91458e14fb4f5afbc927d52f0e648d0871ffc5055f6b5b873c887a7da12
font_01_sfnt_off0000de12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE12 10440 bytes
SHA-256: b8ace8b2e58e7a7cb397864444006bd88427c4cb055333a1cf416c892a5f97e4
font_02_sfnt_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1