Malicious PDF — malware analysis report

Static analysis result for SHA-256 97da7674a50935ca…

MALICIOUS

PDF

74.1 KB Created: 2021-09-02 16:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 247e1be53400daa969e55deac7b892f8 SHA-1: d1f41c464de985e5fe617590b1e5dba12ebf9084 SHA-256: 97da7674a50935ca98c7f0f9f023d9dca3ef84d4f7f3118855e645e0a9860fcc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various domains, many of which appear to be disposable or compromised hosting. The primary purpose seems to be redirecting users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/uplcv?utm_term=yayati+marathi+kadambari+pdf+download PDF link annotation
    • http://yas-center.ru/userfiles/file/63666154344.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/22991122892.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/7rbufvk1c3ve616r5tp2bun5ij/juripezadanilasaj.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/tujusewetekagimisejuv.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/42082340189.pdfIn PDF document text
    • https://wonkingchina.com/d/files/zipulenijaxoz.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/71992408638.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1621484602.pdfIn PDF document text
    • https://digireg.si/upload/40347220387.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b2694b0cd32---ledikitutir.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071628bc9f3d---19808993489.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/86658162172.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103866d1007f---31866303172.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/vubuvamiwani.pdfIn PDF document text
    • https://x-software.cz/data/file/51342185456.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/20709897483.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b16ff44b943---50009772971.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/48354008265.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aba8060fd---fexezitonufoteligut.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e1d9bd901c9---xufubirigazusogere.pdfIn PDF document text
    • http://avs-market.ru/admin/ckfinder/userfiles/files/guvonemovakigijagibutaju.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_off0000bb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB58 18280 bytes
SHA-256: 1409761fbbad0eeed4d806a371c5a639282d510862bba132f36ac32a2fda3c7c
font_01_sfnt_off0000e9e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E0 10876 bytes
SHA-256: 8e3a45ab13d56668baa93273556ac18ba460887523c2ced060747d99b0b5d57b
font_02_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1