Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7bd7bc0ef5d5f6…

MALICIOUS

PDF

74.5 KB Created: 2021-09-22 22:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9e0b7ca897a956ed77a779b4c4d498e5 SHA-1: 1f8ce2f161af32457a0dfe02231e2daf26d25093 SHA-256: ea7bd7bc0ef5d5f6b2160001340eadd6526a88084aa7044a0b4184850aa3d2f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms on potentially disposable hosting indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/i18jrla8sodpkdhrsm0ue2ac2g/20359839888.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3a630aaa---35707156329.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d259ccfee---28406101434.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lafajirivefewid.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/30114073743.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/kivawetirupepatuwi.pdfIn PDF document text
    • http://xyr59.com/filespath/files/20210921213549.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/5332741499.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/72042841758.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210921203159194.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/78068483057.pdfIn PDF document text
    • http://abwingscolley.com/uploads/files/42646599044.pdfIn PDF document text
    • http://ltpbetel.ro/userfiles/file/putanunezukumebijelaputi.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/belapapu.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/vokatunoxavikowe.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/miwimonifakosewigutu.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/xavozaleximelugenaxuv.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/tetupuzek.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/nogazonejedofuledi.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2eb6ce5f6edc7b47ab605b664b96c7a6/58613697862.pdfIn PDF document text
    • http://xn--or3bo5mvlb.com/data/editor/file/bonodexinukugovibonomuk.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/89102718090.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/mexuwetojefezasido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=react+native+expo+apkPDF 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_off0000c08b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC08B 16976 bytes
SHA-256: fc8743edaccb04d460862ea9e1ad7fee961ead3c0dcfd245aad53e8812900fb0
font_01_sfnt_off0000ecdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECDF 10360 bytes
SHA-256: 5bdd14e4207efae21b1d2ea6450e65551d81b3d2dcea58bcc9f89ea8902821c2
font_02_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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