Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afa7dfd4f38c4f5…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 14:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ca9a69a40163a348a1fb6c99c4143100 SHA-1: 2bc959f213901ed7366463800a4fdb08c5307a20 SHA-256: 9afa7dfd4f38c4f5a51e5fc20a3ab5b4b600b0ed416b39f840924b2f8efdb65a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://infrive.ru/uplcv?utm_term=led+tv+screen+protector+price+in+pakistan PDF link annotation
    • https://viessmannboilers.ca/fck_upload/file/mujapesogugajil.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e0cadf53c---1634846552.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/92882945631.pdfIn PDF document text
    • http://danangsculpture.com/uploads/image/files/rowixesadupunakij.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/zapejasevotowag.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/xomozovibowi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/fed97b4224747e6beebadb8f4735670e/piwomegemo.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/nuwawuvusowafe.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/fibafura.pdfIn PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/99553707464.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/13601885548.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16137346f5a1b6---61002343868.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/8543b05f428e8d99a95a2c5eaab08d51.pdfIn PDF document text
    • http://rassadaspb.com/new/files/file/gavalozufomavukujerudob.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/38290917066.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/62118420763.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/77572115759.pdfIn PDF document text
    • http://kaies.cn/upfiles/210913152644195409m05zy5.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/bakifela.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/wezakijebuta.pdfIn PDF document text
    • https://birudongker.com/contents/files/68388626876.pdfIn PDF document text
    • http://businessdevelopmentcenter.pl/uploads/userfiles/files/pigav.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/kinijifirobomepejon.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/64397900337.pdfIn PDF document text
    • https://kham.vn/userfiles/file/gofabulokalufeza.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_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 10576 bytes
SHA-256: 3da6b0277e2603a47150a51b40ad24d46fb6393a84ca1a3a3f75675718174ce5
font_01_sfnt_off0000eb59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001036b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036B 18720 bytes
SHA-256: fe905596802a2693931fb30924e7795418873af6586e887d592dec89e51bedca

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