Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa07763f7a02e82…

MALICIOUS

PDF

87.4 KB Created: 2021-09-07 15:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0c14ce2985488bd8e20c398db7118d5 SHA-1: 9795b83e546b74f449c158cfcec100afebc54e3e SHA-256: 5fa07763f7a02e8275505ca5c9d5d03cec564a55c279c6a3462311f7e7c61cbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://fsanaq.com/upload/file/210804145931093752o8txv4exssnr.pdf In PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f49417d1651---67554280062.pdfIn PDF document text
    • http://186086.com/upload/files/6196067887.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210805_DDDB6EFE45917061.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610665bf7bb1c---55969732697.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/33c343721e4b1e68dc190e0bd32b51ad/wofixadeb.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/wuwadiwi.pdfIn PDF document text
    • https://turbooto.vn/upload/files/92815034304.pdfIn PDF document text
    • http://goref.ru/files/file/popadojodinakewosenewure.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/47633995394.pdfIn PDF document text
    • https://filetorme.com/upload/files/97542511960.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160efd9f1b0e90---kepig.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/141310224810.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/77463797132.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/kigixiwunedovusenato.pdfIn PDF document text
    • http://leadershipcareer.kr/fckeditor/_upload/file/7686057553.pdfIn PDF document text
    • http://ceramkgres.ru/userfiles/file/podixobexarawaf.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f21498c79---46126725066.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdfbab37d3---42087342677.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610861ff18ae3---55428909092.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/dusepuxarudetuj.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/fenebaxotigev.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e9211467ec74c159c8162159e87a0ce6/95074839412.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/84553ca7825f8ce533ec2b6f00707a48/40725834986.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a901029dc4---nogodenezawikiwabenuxuv.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b77cf9818bc---zatarodupoxera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cognates+worksheet+spanishPDF 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_off0000ede8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE8 10696 bytes
SHA-256: a0d2c279d7e6a3ea61aaf75c52e9ef95670e2f4c4733378323d643b2218333e6
font_01_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9C 18976 bytes
SHA-256: df3890cafcc9208b28d4359e3500c19235e7811a4c4f5ec61459734a6170ba0f