Malicious PDF — malware analysis report

Static analysis result for SHA-256 48139e59ab48363c…

MALICIOUS

PDF

85.8 KB Created: 2021-09-03 01:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 44a72570889fe2b80814d538309691e4 SHA-1: 823bfad8427761892f119d3235356889224a9d49 SHA-256: 48139e59ab48363c8ff7624e3e5aaa4b835448aea0d19468b41b24ea4d9b26be
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains a link farm pointing to various PDF files hosted on compromised websites, suggesting a phishing or credential harvesting attempt. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. While no scripts were explicitly extracted, the presence of multiple external links and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 http://fzsvybbs.at/userfiles/file/begesi.pdf In PDF document text
    • http://avonsteel.com/UserFiles/file/kubafenopowozep.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/e92c0d671f0e6a24615065aa1cba81ea/70247221940.pdfIn PDF document text
    • https://ancoraeducacion.com/images/xoporazepera.pdfIn PDF document text
    • https://ptkas.com/kingkong/userfiles/files/bonese.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090f85209f92---dopugol.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611841fa86534---fuxawibasekipokemoned.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/rubusitaxosubukixewaveda.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/89079926328.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/f1aa19b0b94dfa629d06236de9d97e39/86354537890.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/7382512061.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160709580b456b---11864571171.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/ruvifubitiwuxativov.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/5k56jnrc51a8u3ihjcnk7tls5q/rewukojegolofi.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/gubomipixib.pdfIn PDF document text
    • https://hanmarklight.com/UploadFile/files/zapoxazojagewe.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ebc5d3381---40647686092.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/repatuzolelawerafab.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/nga34o4p8hrug7r5cc2d1ff0c9/vufusidulekotokevu.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/zokirijarepekevivijir.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1611259505ccdc---19481375103.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/202181133345814.pdfIn PDF document text
    • http://maristaslardero.es/userfiles/file/xudilixuraramoxuvo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=shiva+mahimna+stotram+telugu+pdfPDF 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_off0000dcc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D9 21900 bytes
SHA-256: 3046b0506dc9909115fc6f6bd0359e0c849b8a19bfdabd415c7cb959e6308563
font_02_sfnt_off00012f59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F59 11188 bytes
SHA-256: 78f1b0159489c1a27de8a0ee8487b6d6910546ec484cfd3846d7c2cd000ead49

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