Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02cf69c8ef0f6af…

MALICIOUS

PDF

67.1 KB Created: 2021-09-26 00:33:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a82017a53fa4438f009c04286390fb2d SHA-1: a4135a6d8c1c97402419b350352b9f26ad19b030 SHA-256: c02cf69c8ef0f6af4ac9e3b5c90df6174ea485a09fcba7fe7f15a20631f661d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics confirms this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6388

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://irlanc.ru/uplcv?utm_term=teenage+mutant+ninja+turtles+rooftop+run+apk+download
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614debc6e2aba---bokevifazofekedavilez.pdf
    • http://1544-7419.net/upload/fckeditor/file/maxewo.pdf
    • http://appextskihjthj.handylover.com/upload/files/redajemapiriw.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kcuenr9rjnuk5s4u3o7hjjemsb/94591369015.pdf
    • http://zdrowejaja.com/Upload/file/42592669273.pdf
    • http://grotech.in/userfiles/file/45441219258.pdf
    • https://5703n1n6999-6a55.com/contents/files/kabixonofigifovefavit.pdf
    • http://szentimresiklos.hu/upload/file/2816331297.pdf
    • http://clinical-pain.com/pds/userfiles/files/tozosiworewoxarodupuf.pdf
    • https://equantumconsulting.com/files/files/61824648076.pdf
    • http://thekreativecompany.com/uploaded_files/userfiles/files/44521438727.pdf
    • http://fzsvybbs.at/userfiles/file/misedelujewomidefak.pdf
    • https://ku4ysk-9lgp4y.com/contents/files/33117999507.pdf
    • http://faceconnects.com/ci/userfiles/files/pumuvi.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314aa6c9b7d---85237657093.pdf
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/34608495337.pdf
    • https://giga-tronics.com/userfiles/files/rarigavaraworutev.pdf
    • http://af.ssla.ru/images/fornews/files/sububizixutoxiwax.pdf
    • http://kursadowicz.pl/Upload/file/naxasibefuniluke.pdf
    • http://automozg.by/upload/editor/files/magovoguzalagitevozob.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000acb5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACB5 16792 bytes
font_01_sfnt_off0000c4cc.bin
58cccd49f77cbb987091d3277cd2e5058353204efd2d1bc2736ad832c4348c8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC4CC 11212 bytes
font_02_sfnt_off0000ded4.bin
bd96801716608de397a44789d0e77ff6fbbb249a9d8435d08479ec4beeb265d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDED4 17276 bytes

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