Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d0b55c7ea0228e…

MALICIOUS

PDF

78.2 KB Created: 2021-08-07 19:37:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92bd09787ed0561e6afd7784f75b9b14 SHA-1: 144460e057abefb68975ed6336294f2b485cc835 SHA-256: 61d0b55c7ea0228e867248fe827e9bcb5be5ffcd29353343032979a6d1f6ca34
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8558

Heuristics 5

  • 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
  • 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://krisoc.ru/uplcv?utm_term=report+writing+on+road+accident+pdf PDF link annotation
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021080502001580554.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/85088985293.pdfIn PDF document text
    • http://industrialdevices.in/uploads/kudekegubedirezima.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c11e11dbe8a---sipilemixedoj.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/43006568578.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/0378bb889bdba0bead2ecba4805c7319/tapeferatukozafa.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/7ba1e7312891d4207eb9a73f75c2b994/70970633544.pdfIn PDF document text
    • https://gomaihoa.net/upload/files/50226251709.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb90ca055c---xaliwumopuxutevikow.pdfIn PDF document text
    • http://mosjob.ru/images/file/rabujevura.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb20bd5975---47589657981.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/kaluxus.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/16919671214.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/c5bdb21393db3cb397f1a134efdc52be/resegoj.pdfIn PDF document text
    • http://hydrem.ru/images/file/gejub.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/kajarerotidijovususovan.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/magazovexuxamopibo.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16083f12979573---14766220772.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/10d6d6f38b744215e4502aa75e8c2d6f/74030441186.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/687509998.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/nogalevivesolig.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/cet1ok2d4vo7pfb7ltfm3f70u0/40277391694.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/jetobilotonutasuve.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BF 17096 bytes
SHA-256: 5435b59fe7c924fc9effaef07250de477c838540334cca916ea3f7ce8762cd16

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