Malicious PDF — malware analysis report

Static analysis result for SHA-256 9da0e92e88ab1af8…

MALICIOUS

PDF

85.1 KB Created: 2021-09-23 20:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4cfff6053082cbe099f9279390443553 SHA-1: 7905686f29dd5fecfe16b178080fcff15a7c95ef SHA-256: 9da0e92e88ab1af8eb3b47c8ebff5151914c2a1a8c12fd7c1c7543c557091f3b
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or scam attempt. The heuristic 'SE_CALLBACK_LURE' indicates the document likely prompts the user to call a phone number, consistent with callback phishing or tech-support scams. While no scripts were directly extracted, the presence of external URIs and link farms suggests the document is designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://coretry.ru/uplcv?utm_term=gta+5+money+cheat+code+ps3 PDF link annotation
    • http://rentbucharest.net/images/userfiles/43441404854.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/77128319414.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/bubupokagitada.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/zakopukonokuxotov.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1470796ae---54113712838.pdfIn PDF document text
    • http://3q1p.com/upload/file/21091322125764850120pa2la3yxe9.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091208173773499.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/14867225477.pdfIn PDF document text
    • https://groupburuemas2.com/contents/files/dekesofe.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/bodamuletularu.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/zasubawuxinokebebiminitet.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/41630600895.pdfIn PDF document text
    • http://www.siposferenc.hu/html/98175935579.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/73583117745.pdfIn macro / runtime command snippet
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146fe7ba5298---25996165041.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/negari.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/xobufexuk.pdfIn PDF document text
    • http://energyexcess.com/userfiles/file/84051930677.pdfIn PDF document text
    • http://solemarservizi.it/userfiles/files/riwoxuzepuji.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/zogudinezofebiduzije.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613170001ca09---6457797799.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/16779877314.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/sinolezozumevekopatixatan.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/31793502067.pdfIn PDF document text
    • http://www.siposferencIn macro / runtime command snippet
    • 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_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 11000 bytes
SHA-256: d6b8163039fa69375c3d3e0a61920dbfaecdac8da07187da9864a2c024564a90
font_01_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 17360 bytes
SHA-256: a4bf3cea745706271b1b638de65d750d56398bfd6b288b50694e21f6a20bf55c
font_02_sfnt_off00012e5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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