Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a182a9193bcecc…

MALICIOUS

PDF

82.0 KB Created: 2021-09-20 12:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5e68d4bea25ca5e67f041fb63215d58e SHA-1: 43e1eaea15667d890ed184f0bff97463634e00ba SHA-256: a8a182a9193bcecc716d531bf38a480bba1eb4c6060a75dc2f797dc75b42e556
204 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'password-protected archive handoff' heuristic indicates the document likely instructs the user to open a password-protected file, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=gallery+vault+premium+unlocked+apk PDF link annotation
    • http://baby-daycare.com/uploads/files/202109180658213688.pdfIn PDF document text
    • http://braghieriarchitettura.com/userfiles/files/gumamujademajunuwaj.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/71299454912.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/wigawitibosavifuvesozulak.pdfIn PDF document text
    • http://vanhacollection.com/images/files/pokoxatuxokavufojewasedu.pdfIn PDF document text
    • http://jadeite.ru/images/file/negofofitinanisedipazonum.pdfIn PDF document text
    • https://melz-feu.ru/upload/73088427130.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fde51cf39b---bexulusifilodelukelu.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/86333413439.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/43501450569.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/59309412583.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/winivitelawiwuf.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/rukoxevak.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/degowegomowato.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/20106357396.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/51589602364.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/sizavevutalojiwegovonu.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/de452e5aa57f17b9c01b336c28d7d0e4/1949614138.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613289c703d61---geganijijaf.pdfIn PDF document text
    • http://thietbiytedaibao.com/media/files/53216200494.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161302279ab9c1---80247576700.pdfIn PDF document text
    • http://siciny.eu/userfiles/file/wulimisurewuroxe.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/tixutawasigekalona.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_off0000dbe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 17548 bytes
SHA-256: 3cd632e68a21e975625e910807cdc1a190c7760436a7e979061418f5593c9425
font_02_sfnt_off000120f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F3 10916 bytes
SHA-256: fc1c78f637d274d53c644deb90e3dc3d4c653e464cb6c0290d87da61fe5a6fe9

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