Malicious PDF — malware analysis report

Static analysis result for SHA-256 d152662ea105396c…

MALICIOUS

PDF

91.0 KB Created: 2021-07-26 07:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ecda9ad3e9f88b765cca8eff5c915824 SHA-1: 33b309ffb40a9aa15c8839cacf483fac3886072c SHA-256: d152662ea105396ce572d838a07c46bb4a2c30b99f04d9d5990e52b0b22e53ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms or disposable domains. While no scripts were explicitly extracted, the PDF structure and its nature as a lure suggest potential for embedding malicious JavaScript or exploiting PDF vulnerabilities to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/zijixalidimib.pdf In PDF document text
    • http://pandoreunion.com/clients/81456/File/binuwevu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/954da3b6aaaf9ce9256b36ee949c49e4/25744259343.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/092ce5ee822bcd1e897b128b7dc6d70d/84868342539.pdfIn PDF document text
    • http://komputerzagrosze.pl/userfiles/file/82475156688.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/58e7bd7ffe231316a0d25d2bfb7aad21/fogorewibasuzunebodizex.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b00d041ff14---43090253222.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074b60934329---fuvokenodirebalawis.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/bidezu.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/raluzafiwuzazotakoxubir.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da4f095296---segonedilibuveloredufem.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/72524608569.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/suder.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ei1k2dsuq16erdfi8bd2m65ur0/26097406121.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/244cdd911c3eeb2576577bfba960e237/roxisivubuxakilisivowuxuf.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/damibiwowunutavumaxu.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/89789469198.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/tivenewi.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/piwazidibofeg.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160877cad2638a---47238669796.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b995e1d53ae---texabajo.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/30062647964.pdfIn PDF document text
    • http://jcaf.or.kr/ckfinder/userfiles/files/gazog.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74a214b130---dalonaratut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+many+hours+for+99+slayerPDF 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_off0000feeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEB 10748 bytes
SHA-256: d594889dc9b177d37d814773c12c1c0f44f6c5116cd888981aa259cdd1ffdaef
font_01_sfnt_off00011784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F96 17860 bytes
SHA-256: af862cb1952a8da3c95172510c15adf445715b2aee271f63c66ee4bd80c3f8fe

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