Malicious PDF — malware analysis report

Static analysis result for SHA-256 49f3bdc424eaa896…

MALICIOUS

PDF

129.6 KB Created: 2021-09-15 10:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ee92b0b545dde2a3352a23b47ca9bb9 SHA-1: 1dce7724f5f66faa544fa7e27e1babd0481c052f SHA-256: 49f3bdc424eaa8964aad87ee84f4bb84e0069c7e141ea238a95fafde3142414d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to multiple URLs, some of which are hosted on compromised CMS uploads. The presence of these links suggests an attempt to redirect the user to malicious content, likely a phishing page or a further payload download. The document body is unreadable, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://studiotecnicofrisoli.com/userfiles/files/midipupatogomexeripoxefu.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ikuv4kd56qpappkbhndd5v01fo/4817475923.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161419b34e6910---kidelizabuledakorifijuvo.pdfIn PDF document text
    • https://tekmaker.com/upload/files/benujogifogigek.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f26bd9c7fc---sebuvodifuka.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/8gnarnig8jld75kd23kqbtu3f4/gebazufov.pdfIn PDF document text
    • https://aletihad-group.com/userfiles/files/gumija.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b05e2d0393da6b22fd7d4798f503331e/padizibebozej.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109120812246872.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/58219555446.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/448929985.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/1921837015.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161319252badcf---zezojatuvebovuposepejak.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/40338446441.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/sosunep.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/lipagiworonur.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/17173744862.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/mivodokew.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/vesemisutolajosapuz.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/dejarukutipi.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/39114401234.pdfIn PDF document text
    • https://abrasco.org.br/ckfinder/userfiles/files/39190690041.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/90058856140.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef74661f62---datawusilife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=all+movies+released+in+2016PDF 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_off00018fdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18FDF 20928 bytes
SHA-256: 14f9f3a8b2e575937a6e1dd0403d5ee1f5f2745ee7ac1659a604ccc5edd83e5d
font_01_sfnt_off0001c756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001df6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DF6D 10820 bytes
SHA-256: 49e9992b8f1b3e8600d6d31d67773b68aaff23a14da9e5b76507a0c2ff0fbf12

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