Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d68a25791bacda…

MALICIOUS

PDF

81.0 KB Created: 2021-09-05 10:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d09a639388814b2b360d2211d67e578 SHA-1: 8c13769c10a40f2f271bb629af06c33d42fc3f32 SHA-256: 66d68a25791bacda16e62df4763287610fdd3113a022cdbb4e71337aa09a8509
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with attempts to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://tecsun-moscow.ru/docs/file/97703197888.pdf In PDF document text
    • http://megalabsrl.it/userfiles/files/xerarizekama.pdfIn PDF document text
    • https://telorgabus.com/contents/files/88107520849.pdfIn PDF document text
    • http://azbuka-d.ru/ckfinder/userfiles/files/78616402361.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98288e8cd---develibuwiranegojumim.pdfIn PDF document text
    • http://romovi.net/sgi_userfiles/userfiles/files/62463824747.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/68015819591.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/96628319812.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/ec7341a2c7b05a81e8964496c9e48702/87139085311.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/63962046447.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160969700919cb---badupujumupabovuwuzodeser.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/9ffvdi2cvps5hckpjjkum770i6/66801023035.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/kerukiwekigifeka.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/dinajovusa.pdfIn PDF document text
    • http://ltmetal.com/userfiles/files/jogezufotavesojeli.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/suleka.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/dodabuxojugudoki.pdfIn PDF document text
    • https://fallsplat.se/file/rufaloragexorerefetowari.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16086004d229cc---6471915086.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/3801974a64e5ac1117bb67203ae80b0d/43577990281.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/693a6bdfa602c5fe813e1f9db5ef40e4/depimi.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/4517ab2e06441d19545d7d1bd4d25219/zutupunavumakagimifato.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/sibenodetit.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/962527e98ad4f9fc5b9d10273276becb/82745147938.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/84557468595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=competency+based+human+resource+management+pdfPDF 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_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF304 15916 bytes
SHA-256: b9e568fefd62cca3d1e5f04046d2e3ad813de4ef16ccbd92a97ac73aa1be1cf3
font_02_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 11316 bytes
SHA-256: 0bc407a8f9dbf47ec9c56646195bc8277d1b679e825b19d905a13594d3a52e47

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