Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a061911162cf45…

MALICIOUS

PDF

83.5 KB Created: 2021-10-21 11:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 87db9908275d7e4200e4a86df05b0588 SHA-1: 575f65bcb87a03cf28f0dc2d598342221c90ff29 SHA-256: 71a061911162cf451ce474ef90382a328fc3a1cd1b60f24e1397ee1ad1ff0591
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external URIs and the PDF structure suggest an attempt to leverage web content for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://medvor.ru/uplcv?utm_term=hot+stories+in+pdf PDF link annotation
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/650c66a8c68f80c625b22b9d87900b72/guzubusejijowixik.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/91561226366.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/55636913829.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/pewometudatevusifokuwu.pdfIn PDF document text
    • http://cieplej.pl/imgturysta/file/74002949244.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1616d3d4ea99af---92035198413.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/4c35e40536fdfe3761faa82bbc81c17b/62773389097.pdfIn PDF document text
    • https://beautydent.hu/editor_up/54787607338.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/83926669904.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/3779dfa8ce4b4cbe3a1c56e6910d2a10/93392125698.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/sedopogu.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/5125039489.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/kijepupuletafal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161614da6dfdd3---1139095354.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/gavopi.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/bekewob.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/wefonijevekulifufitelam.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021928175116031.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/widixewuxanuzonogusejomu.pdfIn PDF document text
    • http://ocung.net/img/files/ximugoso.pdfIn PDF document text
    • http://f1-rennsimulatoren.de/userfiles/file/55278318177.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/disolilizo.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20211020202241.pdfIn PDF document text
    • https://hoavily.com/uploads/files/feponax.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_off0000dfe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F2 18728 bytes
SHA-256: 172d6a783285f9145cb18cd464c421770c0c5fc70671b6c9cece86083093096b
font_02_sfnt_off00012957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12957 10272 bytes
SHA-256: a111e8d778e0d1bcdfea49641b53ea29a4e7a65fd982d6e153f4479a7db278b7

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