Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42dadc25b25245b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-02 04:17:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2f36e04625fb1f88ba55c83edf60f935 SHA-1: 06e438f03f55e13001e3ce8140d92d4f108a9f54 SHA-256: c42dadc25b25245b3d44c87edde354661fdc136af0d7b405faa1e00c1f0ad0f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812e79364a8---42388228130.pdf In PDF document text
    • http://kamerton.nl/clientfiles/jonisafakurepurore.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/olrvprj5veg3jinqdurmt9l0g6/74622772904.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b20df0884---42275595937.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/fc1ff6c9145d171d941f5514cbe46490/42530655751.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/kexinipifobavuwutus.pdfIn PDF document text
    • http://babamoleskine.com/files/file/vadedepefixe.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/72404088192.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/xegulejupofalekenosutuje.pdfIn PDF document text
    • https://esz.jp/img/editor/files/fixosopiluluzodozilu.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/demozoz.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/xijimojakepavoruladakezon.pdfIn PDF document text
    • http://premium-t.info/files/files/wavofikivexopow.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/ruxifutupesepiriw.pdfIn PDF document text
    • http://ysenb.kr/board/file/editor/file/55599120991.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607864b1c2ce2---6996977573.pdfIn PDF document text
    • http://jar-ted.pl/file/nubeponikoturejovapopamu.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608a994e65a22---kokiri.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/faxuf.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ec98cf4b2d3---bosejodezepulad.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608d999e056f1---wixarotetej.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16070c81ebff7a---sokopedatiralosobuwafun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=four+levels+of+analysisPDF 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_off0000e2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A1 10364 bytes
SHA-256: dfc69f438a0a4a34780f9d0494480a9eb500b4a184fba356c8acb2af6f28aa14
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 17360 bytes
SHA-256: eca6fb5efa5789cb16b46f6ef2c6015d7476b51c4e8a7dc7b4947f5ac531a064
font_02_sfnt_off00012736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12736 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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