Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b476e7ea76bac2…

MALICIOUS

PDF

80.5 KB Created: 2021-09-18 22:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b830941893e47f8e24fdd83c0f42981 SHA-1: 6f1da1949a8fa3811d7bc5e52b2a1d9b9a573d56 SHA-256: d3b476e7ea76bac23c1a610011c6327df6e8c597b4ff70f4d1a6963789e593a6
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 are part of a link farm designed to obscure the final destination. Heuristics indicate it's a link farm on disposable hosting and points to compromised CMS upload storage. ClamAV detected it as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious, strongly suggesting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://fedime.org/imagenes/92977690566.pdf In PDF document text
    • http://emachn.com/data/attachment/file/73224183191.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/38994143274.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ef3a61a4de---xujegafesomefusejane.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/puxatawinekadidowotud.pdfIn PDF document text
    • http://snft.ro/media/file/kawilirubol.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/gokulugirebakalozuzusali.pdfIn PDF document text
    • https://digbijoynath.in/uploads/userfiles/files/5996696749.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/46172830369.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/67284316211.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/fotunivipel.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/57664384489.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/nibidubu.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/86575308271.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/63588048279.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/59232307943.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/62238245405.pdfIn PDF document text
    • https://transport.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/kusazexamivifizi.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16133bea1e2670---60045340764.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3df8a119---sawosukitizakigegaxu.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/79363575429.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/15971662449.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/2817848681.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/23088899673.pdfIn PDF document text
    • http://usarsenal.it/userfiles/files/kurojipedunapivolesur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=toefl+writing+vocabulary+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_off0000d557.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD557 11096 bytes
SHA-256: 87df7598dc48e2920dcdd7d4f0f2fabacc1d9647274bf6608a07ff8445d39a38
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 17648 bytes
SHA-256: 3616b9420963d9113157010332af48328e07ecec0fcb69fd79799bbc32ae2aea