Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6dce198198968ab…

MALICIOUS

PDF

94.0 KB Created: 2021-09-18 06:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f04afbba5eafe19eb44d444d538cc9ac SHA-1: 5b93815d9ba1de77a5f3e22c2d60d3463121e462 SHA-256: a6dce198198968ab9ed080a8a37dbd094ebd558327bbf65af69d6c0ef856f950
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dinhvi5s.com/images/newtech/files/80214156381.pdf In PDF document text
    • https://limberhurstgallery.com/imageuploads/file/fejudew.pdfIn PDF document text
    • https://fasaac.org/temp/files/dezawegikolafat.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/22618871895.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/jubemejun.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/fanubu.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/82558c5487ff9a0065c1b75dc6649044/devenudotezatobomet.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f12c798b8b44e2ee5085f7a253e4ce97/korofazidonikidewafifadol.pdfIn PDF document text
    • http://realfootball.gr/userfiles/file/93399866895.pdfIn PDF document text
    • http://forepic.com/_UploadFile/Images/file/22385574517.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/10009040554.pdfIn PDF document text
    • http://villaroyalenews.com/userimages/39895354278.pdfIn PDF document text
    • http://domexpo.ru/up/file/4718574615.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/belevafijugewilun.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0ac3fb84---metiwusifofutabasimamodof.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3e6b9c4b---11125219419.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/23595256240.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/banomebudukewus.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109061131585406.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/kaxupaxaxovoguzas.pdfIn PDF document text
    • http://topspeed4wd.com/ckfinder/userfiles/files/fugegetonebosowufefezu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=free+10+followers+instagram+trialPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/85691873677.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_off000109da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DA 10796 bytes
SHA-256: f6a27a597a32f13845fe279ade3c075572061ddaef4f8a17bef836a6cabeb9e9
font_01_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 18416 bytes
SHA-256: ddf4e9119cf52fc59766831a2b373d413f006000a2f4845816e761975e01f1b3
font_02_sfnt_off000152b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1