Malicious PDF — malware analysis report

Static analysis result for SHA-256 feca590d9cdecc9f…

MALICIOUS

PDF

69.3 KB Created: 2021-09-27 22:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f3871acf030f89b3aab6910b5513375b SHA-1: 09422a1d75584c203b92dfc66d7f11ee8a629105 SHA-256: feca590d9cdecc9f92b1902ddd6b516fe9fde6f675aebfd2a51b651f5b293a7e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to other PDF files hosted on various domains, many of which are flagged as link farms on disposable or compromised hosting. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. The primary attack pattern involves luring users to click on these links, which likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c33b03e150a4fd77d2aaf7f29c46bbe9/64682915052.pdf In PDF document text
    • http://grafitym.kz/files/file/5899141024.pdfIn PDF document text
    • http://wych123.com/upload/files/74120203699.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/kibape.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140802996091---xesajanirezulesavamo.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/46106141019.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/32328089814.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/10522271610.pdfIn PDF document text
    • http://cana.vn/uploads/userfiles/file/75956684052.pdfIn PDF document text
    • http://mya1fc.com/files/ckuploads/files/56787169898.pdfIn PDF document text
    • http://sdes.in/uploads/fogusibegazijipalawakewe.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/161480cc447c5b---zesutimariloxenosuj.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/lowupezuvile.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/48843060518.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/4719edca78bdeff930f7997f2ac8dff3/436260185.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/xufopuxuf.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/47288197520.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/77612654958.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/sumenodutaj.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/navaxetutinix.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/097b87ec300e04aeb51bd9a0dbb5cca0/24289888807.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/3987142859.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/kikinezovofiwol.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/8114036442.pdfIn PDF document text
    • http://ipayon.com/root/FCKeditor/file/subatadatidatuxuname.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/28025728737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+unlock+an+old+android+phonePDF 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_off0000b157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB157 10712 bytes
SHA-256: dab04e0dc72e9416503185ee98ce083c6e19dbae47915629d33d042a1cede2cd
font_01_sfnt_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 14332 bytes
SHA-256: 9d2927c860bb1e2a90899b67e1e333126d67ed894fe2b85c4c803c5f7de4ebc7
font_02_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1