Malicious PDF — malware analysis report

Static analysis result for SHA-256 b97587b2ecb517ef…

MALICIOUS

PDF

79.8 KB Created: 2021-08-01 03:57:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 135e5982bac24c9c30d082676e3d4c2a SHA-1: 84b151d8f817cfcd57b90b8bb57320d738c8d024 SHA-256: b97587b2ecb517ef0e7b1ed179cd91c4be332982807aedb9302eefd35a17b65a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c80d74d7a---5750907615.pdf In PDF document text
    • http://innotec-industrie.be/userfiles/file/gonitiparugitafi.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/zabozejunurigodisexi.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/tumekavifejujigesalufo.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b810db7ad8e---26906854708.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/47560589377.pdfIn PDF document text
    • http://hanauhrova.cz/files/rajofuka.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/koseko.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a0874a04f5b---27400069687.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210622175744359202438.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/34872480522.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/d9a0fc311a6c2646c7a7d3aa0807224a/49832091990.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/rabutatujutorujogit.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/98617663942.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e6c3cf8a1ef---koropav.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/87814839070.pdfIn PDF document text
    • http://banghaija.com/userfiles/file/dubefubufegidanepive.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/40822178657.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/25ac769a8ec5eecfcbfee22b34f0a134/37703679820.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/zewud.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/11aad752b1bda26ab15794ead40136e5/popezo.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/1vrvailg93k3lco41q39jb4him/namovugamukirosesuzesinak.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/mikubavelawejul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=adanga+maru+tamil+full+movie+free+download+tamilyogiPDF 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_off0000d7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB2 15584 bytes
SHA-256: 2c67029d831ce64280b08beae7eaebd3464d1e171abcc47ff94a2734127c9425
font_02_sfnt_off00011788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11788 10876 bytes
SHA-256: c178804631e2c976d33e5841e7b2f0d41eb7d620ed37507a11550700d055a93d

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