Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a5cc7922972e008…

MALICIOUS

PDF

74.4 KB Created: 2021-09-11 21:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79e48c019546cf9c688b1c8fdf3c552c SHA-1: 71c1deca4c06c8309a37a553c96e2da128869b7a SHA-256: 9a5cc7922972e0084b54e0ea12bef1700accdc781dd697f4f02cb31f19e3086a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads 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 distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/xavez.pdf In PDF document text
    • http://lindseyderence.com/userfiles/files/56244534397.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/47n2pij8eogds3pa7nvkig9uhb/kitowurur.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/binunaxavaxub.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/movuzapadezozo.pdfIn PDF document text
    • http://tortsurprise.ru/upload/redactor/files/29752127025.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/zexojipifunalaneril.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613be5e3f2905---wevoropo.pdfIn PDF document text
    • https://csn-alliance.com/data/files/38262277488.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dotabowa.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/buvavuvomebobibekoxij.pdfIn PDF document text
    • http://zerosquareonline.com/file/zonazeriwakar.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///vogisenasijefiwapoxiwu.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/80165591555.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161329fa9d47f7---28393184816.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/72b45cd6dde213a7955339bea6c06bbb/77442904518.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/16278831375.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/fililarezajavuzaxapi.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/xolubovakipotibokunes.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/62515951342.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/vukexipazodogaz.pdfIn PDF document text
    • http://reichspfarrer.sk/file/3698008403.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613549b19d6b9---bopiwa.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/48731907965.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/52425042861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=shadow+fight+2+mod+unlimited+moneyPDF 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_off0000bc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d48f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48F 11028 bytes
SHA-256: 6fdda61323d543147e199691a5775491d93cc2a999df858b16a18f44866bd95d
font_02_sfnt_off0000edf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF7 18208 bytes
SHA-256: 535147aacedf3dfd44c6f377c179fd0fe8418210445be316f962e2a71bd08281

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