Malicious PDF — malware analysis report

Static analysis result for SHA-256 57f8f0a6a8d80f67…

MALICIOUS

PDF

85.3 KB Created: 2021-09-03 23:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 620e0fc794377f4b58c6aa26fa9b8365 SHA-1: 852d8535d88cad759f8511b7155ddfdf8ebfefb8 SHA-256: 57f8f0a6a8d80f67540dc03af634f1e8e89a4ecaa6a1a1ff9e4ee4f9899befbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://learn-atdi.com/uploads/files/bapuvagulakosurox.pdf In PDF document text
    • http://www.drivingschool-brno.cz/files/files/wukelonogefatuxawonobak.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/89174065480.pdfIn PDF document text
    • http://htcable.cn/d/files/gezezanesomejikerubu.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/4ppfc9ldto500t4kbe3svj4262/tavamodijuvufulatit.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/21467428090.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a4f51c825---xefolulud.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/bokapusumexov.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/witumumeviwiterumid.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/narututemonavonugujuler.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210718093138.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/gubasukoviropavenavudok.pdfIn PDF document text
    • http://lifecontinues.ru/images/files/zolofiwoxivonarumi.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/38992013353.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/dugug.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/totaruvo.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/8aa00700a8313339d30a47028007c32c/gabefagetewalimig.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/57047494244.pdfIn PDF document text
    • http://romengo.com/ckfinder/userfiles/files/35928698542.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/97358869580.pdfIn PDF document text
    • https://solener.info/ckfinder/userfiles/files/94564844554.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/galefeputufebasitofel.pdfIn PDF document text
    • http://hubbardfamilycircle.com/clients/62940/File/jozuvibogapomedad.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/14513042898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=customs+%26+excise+management+act+%28cema%29+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_off0000ec0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0E 9756 bytes
SHA-256: 1f7c2f1ee94db0cca7a5f76ce2078f1fbe5a1342d97f1e93f89021f1a9e0abc8
font_01_sfnt_off0001016e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016E 18012 bytes
SHA-256: 0db2088c8e6dbe0bd24356d972bc98012b2996c056731154375d0cf587f1ea49
font_02_sfnt_off00013052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.