Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f65d8473a030bd6…

MALICIOUS

PDF

97.0 KB Created: 2021-09-06 20:26:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dec68d9c4edabad0df5866ea72c1c039 SHA-1: 29332b33de7f9e0bd55658bcc5a5bfb2ef31f06a SHA-256: 4f65d8473a030bd6aa9571c84bd7637f6ce58dda82ec2df3d0e2ca7262178e8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or link farms designed to obscure the final destination. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates a pattern of using compromised WordPress sites for hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://dinskayarealty.ru/media/file/tukupozoxamikufemodazaf.pdf In PDF document text
    • https://broadcasthub.com/ci/userfiles/files/busafakidigo.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/xagozizadodubod.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/pesizab.pdfIn PDF document text
    • https://www.cdsale.org.au/application/third_party/ckfinder/userfiles/files/13641415028.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/452nof4d5jk9kfbdh53i77rgn5/61547169570.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/64468858872.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/67395988850.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf81b2135---xemifenolufemipos.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/99100744780.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/nufarilotirigafuxene.pdfIn PDF document text
    • http://cartopack.com/Images/file/kuluxiju.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/ditivabitoku.pdfIn PDF document text
    • https://fundreamz.com/ckfinder/userfiles/files/3114483268.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/robenotarotibo.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/87679387273.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/jtpk2p9ug9ic5lujjtbcl1lvt8/24207140334.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f0657441486---susofekozedumawikaf.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/68097329644.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/sokemimamowox.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/37938323132.pdfIn PDF document text
    • http://www.omt.ntou.edu.tw/ckfinder/userfiles/files/wuvowitotopomizefumek.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/950c96cfb1eb9b6208117b01b66aece9/gitakir.pdfIn PDF document text
    • https://gofropack.com/wp-content/plugins/super-forms/uploads/php/files/8e9b326eb6370cbd084f3d398270387c/24864369467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=hp+envy+5020+user+manualPDF 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_off00011606.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11606 18464 bytes
SHA-256: 942d2b34aa5a522f1a8234aad99125d5185ac1cb3388e03840ca62db87daee08
font_01_sfnt_off0001459e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1459E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DB5 10748 bytes
SHA-256: f37debfdf1aab916f6fd0cc303f834b7bac8c6ea0da41fdb18f6177f3258ee32