Malicious PDF — malware analysis report

Static analysis result for SHA-256 6963983f17e9f5b1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 14:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c496f4eb7b41f5227a04a20de3b076d SHA-1: 58e3d1252082bb3ed1f3bc7ece0452af28498cc3 SHA-256: 6963983f17e9f5b1d2e41054f5dadeacf9f68286ffc932e04a4062129c455718
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a link farm pointing to numerous unknown URLs, some of which are hosted on compromised CMS upload storage. This suggests the PDF is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://majortaylorride.info/images/uploaded/file/12036499007.pdf In PDF document text
    • http://cl-pub.com/files/files/xikolumixu.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/penenibuguvifezewof.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc8140e187---88481600392.pdfIn PDF document text
    • http://belst.by/upload/file/turelizobeva.pdfIn PDF document text
    • http://centrons.com/uploaded/file/1768978475612f94bdc5c50.pdfIn PDF document text
    • http://www.bongbansaigon.com/uploads/files/satekexubagolejafitopu.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/zarakurito.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/vefiwuzekajuwigowivekix.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/21437945191.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9b251fda6---23771243589.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/361c95b1c5ae64637adbf50d263389d3/bofitavixiwusori.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/tawobaz.pdfIn PDF document text
    • http://gazdalkodjokosan.hu/img/userfiles/file/duzukijiloravutizojoz.pdfIn PDF document text
    • https://brakos.it/file/39861519631.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210913_194809.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f84fc1026f---takagirefinugesetekuwati.pdfIn PDF document text
    • http://vzwsportenmuziek.com/content_docs/retedumodazetabog.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/rofijozetudoworexa.pdfIn PDF document text
    • http://irodaszer.lukinserv.hu/file/90667192590.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/budujojimaliw.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/lopawumetom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+use+smart+view+phone+to+tabletPDF 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_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 10900 bytes
SHA-256: bbb03b3ab39f3490d4ce527ccd2b34afff3c346b43df8edd1ff66184ef04f112
font_01_sfnt_off0000f510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF510 17980 bytes
SHA-256: 40ce2f09799abdde3b2c3fae399d30ddede5e4e3bab22feeffdc5dacd7e0590f
font_02_sfnt_off000123c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1