Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f4d19b878a324f…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 12:26:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b8c80399b81f2af81c4573104cdeb3bc SHA-1: 8913a6221c95ef994de39afd6bdc29c767ff8528 SHA-256: 46f4d19b878a324f9cbabdb650768bc86c5b510b6630d3da83c71def0f92f4ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of embedded URLs and the ML classifier's high confidence score support the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/navisawuxejiziguraxidawus.pdf In PDF document text
    • http://fanta-life.com/userfiles/file/57436438126.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/letewavobelewudagowiviniv.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/xegemiwibuzosojedojiga.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/xodabetizuvojufe.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/dixikifidavakabolagudoza.pdfIn PDF document text
    • http://szerecsengyogyszertar.hu/editor_up/janidafajadifebepez.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/wubutebizatunufeven.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614506efe091a---najidakipeduwelukelelomax.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/mivete.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/57326849369.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///19553448738.pdfIn PDF document text
    • https://tmtteks.com/files/46462141382.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/mirerepoj.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/vezolesiponaxevaloneturaf.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/2add47244634bd369e160a567f82a06d/40463038607.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/fexusumunozasuxefe.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/54024405192.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144a9e97317f---rugokapedunilogigabuka.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/kodotolit.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161432435e6b27---nesafagatigiganevufazotex.pdfIn PDF document text
    • http://staresecurity.com/userfiles/file/20489227656.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/fiwowibapilokaxuluxaz.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/weduv.pdfIn PDF document text
    • http://herve-coiffure.ci/files/82517485471.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=factory+reset+encrypted+androidPDF 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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 18512 bytes
SHA-256: a245bcdccedd70136982141348c79b203cc8df5ecaecc2fb628544821d3fccf1
font_01_sfnt_off000101a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A8 10552 bytes
SHA-256: 6af3d531046bba9cd43c0255a6119de7fd181f2ea4ee7d1b7c43206a18d2975b
font_02_sfnt_off000119e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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