Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f2724cf19f4f05…

MALICIOUS

PDF

80.5 KB Created: 2021-08-26 12:15:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5258b7a7a28591a067529cbe36501974 SHA-1: 409149f831eb57a38cad744525c036a15b20ae97 SHA-256: a5f2724cf19f4f0526d49f8b08a120532dd9d92d0ed0ee26d1fe4e64d40099fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://laps.pl/userfiles/file/80073898247.pdf In PDF document text
    • http://andrelandberg.com/userfiles/file/ramufigitom.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/73349417286.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/tevodetidubewawepabeber.pdfIn PDF document text
    • http://allivecoat.com/userData/board/file/pabupapafi.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/bcdbe7d36e9f1d44075478d5a68b3540/1866190225.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/b0utiu3tkn794k92lejhatue7u/jevikurujidovemimes.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/viguvuzokabibak.pdfIn PDF document text
    • http://falerisztika.hu/tmp/majimogadukisopejuk.pdfIn PDF document text
    • https://naoshima-habitant.com/74757714830.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090b7054a412---rokuzunugupav.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/40506186007.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608777ff00e9a---tuvosonadotovodedewevoxed.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/97d020157c3f7a37183e36bb8346e896/87626024437.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e4if04isa7f8elrkr54hko1lpp/sirinegofowozos.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160720390693ab---7898350170.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/74366347848.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/porarakusoborumudisel.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/47787363923.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/53416612250.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/22956573701.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/raximodusinotasuwuvogo.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/74226328582.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=the+bill+of+rights+worksheet+answersPDF 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_off0000d721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD721 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 16444 bytes
SHA-256: 3fb36b7b2547c2dc7b46dd8e108f5057b27860e4d78bdf8ff42194091d06bdd8
font_02_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 10776 bytes
SHA-256: 3b0ff602be247e217f7705d1a586cb45f53dba0e3399d4804f12d317dee883e3

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