Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04f8f12666342c3…

MALICIOUS

PDF

80.6 KB Created: 2021-09-18 12:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6c15da46830a1dab3b34dfcd2b09603d SHA-1: 07ca3b06df19436c58ee915088e0726d07331026 SHA-256: a04f8f12666342c3075155859224e8038069b56f30ef42829091e179bef01092
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm, with many external URIs pointing to potentially compromised or disposable hosting. The presence of a 'download button' lure further supports a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the nature of the links and the overall detection suggest the PDF is designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://drafthe.ru/uplcv?utm_term=axar+publication+gujarati+vyakaran+pdf PDF link annotation
    • https://www.rougeindigo.com/ckfinder/userfiles/files/zotomoj.pdfIn PDF document text
    • http://fteq.ru/files/file/67265123590.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/suwuzuxurabapavub.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/kodik.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae4a9cb106---gepojibajowunoralabuf.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/wixagevowugeloxenilu.pdfIn PDF document text
    • https://cyc-catering.pe/disac/userfiles/file/mutogeb.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/51394194184.pdfIn PDF document text
    • http://remobudostol.pl/pliki/51449370061.pdfIn PDF document text
    • http://itexpertdog.nwoasis.com/upload/files/1366469367.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/20519099.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210910_AB8CD4691194574C.pdfIn PDF document text
    • https://groupekheidri.com/ckfinder/userfiles/files/27645358773.pdfIn PDF document text
    • http://bfttacg.marketsearching.com/upload/files/65929627287.pdfIn PDF document text
    • https://www.la-providence-ehpad.fr/ckfinder/userfiles/files/nutusiditogurulaguvaza.pdfIn PDF document text
    • http://lohoithaiduong.com/uploads/files/15475038434.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16134e96e0a13f---kevamowilivobukupu.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16130104768056---kofutadativesos.pdfIn PDF document text
    • http://medtravel.pro/images/hand_uploaded/files/bodeboluzaj.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/kuwagagoxo.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/gorusironof.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210916222508.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gakobaxejonimulafaxoxut.pdfIn PDF document text
    • 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_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 18576 bytes
SHA-256: 1a41ad5f3c40fe5fd0b4ec7a076b95e09e1bcb4d49bcdc626158ad4e8bd5aaaa
font_01_sfnt_off00010244.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10244 11220 bytes
SHA-256: 1baefe547c99fe41f50b28b3ab234df65f848d04b7eeec12e097d9f02281dbb4
font_02_sfnt_off00011c42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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