Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43862f39a754b92…

MALICIOUS

PDF

76.7 KB Created: 2021-09-27 20:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 4d239bb68e9b41d3a9aef68c7fbbca23 SHA-1: 358b539af533f8a1d03ca510b95a78a676489b6d SHA-256: c43862f39a754b92af48c12168d6b06040f44d5e67848f4bf172b6a15d5d0e88
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many of which point to PDF files hosted on potentially compromised or disposable domains, suggesting a link farm or redirection mechanism. The presence of these links indicates an attempt to direct the user to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://huntic.ru/uplcv?utm_term=la+sabidur%C3%ADa+de+los+psic%C3%B3patas+pdf PDF link annotation
    • http://vagtteam.com/userfiles/Files/vosefawaxalamiwisekof.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/lozagasij.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/81477991498.pdfIn PDF document text
    • http://dlshixiang.com.cn/ckfinder/userfiles/files/daxovor.pdfIn PDF document text
    • https://beautydent.hu/editor_up/tivigovelako.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210912042249134.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-18/20210918153846513531.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210908235707.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/kanufege.pdfIn PDF document text
    • http://montazerangroup.com/uploader/file/lilamabopim.pdfIn PDF document text
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/renoxifazadob.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/25af80cf60852ad118b5d931e579da8d/wowagelozefuwev.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021091306492473499.pdfIn PDF document text
    • http://moto-bike.pl/userfiles/file/jexofapimojaxu.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/87177842973.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161495abd3d027---76973927100.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/vurepotapo.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/u532m0cph9bpdn10roj5dn2stb/74014527765.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/54881005486.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/10199191239.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/32015125554.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/49114715118.pdfIn PDF document text
    • https://girl0229960192.com/upload/users/files/80149803396.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/87433074230.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b45a0fd28---89441304235.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210920122432.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_off0000c131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD948 10904 bytes
SHA-256: 32cceb96feb809e952628834eb3e13c378c81d651334807bdafcd588812f4586
font_02_sfnt_off0000f21b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21B 18476 bytes
SHA-256: 5c7cc54c8b8b1906ff2bc706be4d1652abafd5a9c67d3e0bd8823c2fdfd232fb

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