Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc1c89a54c416146…

MALICIOUS

PDF

74.8 KB Created: 2021-09-13 03:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f2525a26c3ef76e97bea26b755a1e917 SHA-1: 6d6e7df933f5f850ca712c80909f3209359dfae9 SHA-256: fc1c89a54c416146ee636b2dff186dddef92e1152a6463752c500d2a25f68cf8
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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.
  • 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 http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86182960386.pdf In PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/ralotumivaxisatimumol.pdfIn PDF document text
    • http://feldbach-tourismus.at/files/45364149942.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/91726115799.pdfIn PDF document text
    • https://franchisefarm.franchiseharbor.com/files/files/tipikoguguv.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/20156987172.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/62722394931.pdfIn PDF document text
    • https://brianhigbielaw.com/UserFiles/file/78548081487.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/4835783214.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/71244656779.pdfIn PDF document text
    • http://amandamaitland.com/images/file/50261803949.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/31769853959.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/bomarawawatod.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/guzivuvagojaxiwojuf.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/rujemetusu.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/jirawinanogarupapowevonif.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/kibaxisetagipomirabaravo.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/61336469800.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd568d4bdc---12589709156.pdfIn PDF document text
    • http://okeefesreef.com/ckfinder/userfiles/files/28951908713.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/t1p8aser96eljjigkqedcctud3/kelijewamafufata.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/98808229207.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6af5a31dd---21345839421.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/doratumaninebunoj.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/80767713028.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/xuxadixu.pdfIn PDF document text
    • http://safetruck.gr/images/file/veruxepunorepevojodi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=asphalt+8+unlimited+tokensPDF 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_off0000bff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF2 10940 bytes
SHA-256: 6777a82c0a242cee3391d5c0c03ce6cefacc85e019ca5d981b2b66bbb1662fb1
font_01_sfnt_off0000d92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 17084 bytes
SHA-256: 5e392664246b916745f50e5501392d4ebb3f974f18eecaadbae48174c99670dc