Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd380890b4a6900…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 00:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8731a7f5ef0499b611aabc7d74235408 SHA-1: 7184251b7fcbbd394a06c2c13d13bdfbbcd081df SHA-256: fcd380890b4a6900d28111fe5c0db828633a5f37f2aa210a169b9a728df7d3d3
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised or disposable domains. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://crysiq.ru/uplcv?utm_term=google+play+store+app+android+tablet PDF link annotation
    • https://cabsfromheathrow.com/userfiles/file/16981411244.pdfIn PDF document text
    • https://okazionche.com/files/17157840641.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/56546642312.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/15029728850.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136561fb8f3d---dovedu.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/16129509319.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/94174851262.pdfIn PDF document text
    • http://espicycooking.com/files/file///68827966904.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/razewumedag.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/xirevoto.pdfIn PDF document text
    • http://bscartridge.com/pic/78107300068.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/55504489386.pdfIn PDF document text
    • http://regmac.net/userfiles/files/gememawiremiruje.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/xelisegukudododa.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/zurexizabukusebaje.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/gunomeligonoru.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/27425147820.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaa42d1338---xusubijamepor.pdfIn PDF document text
    • http://qianshunqs.com/admin/upload/19943264389.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/e41ecb9240cb3b12b15e8aa8e79bfe2a/66318740590.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/zujeri.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/ragiponapixopogaf.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/60928390314.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/felulinolejev.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_off0000bafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD313 10860 bytes
SHA-256: a0eab3d7a9295ddf6280c6a24ff9e0291e54dd9791480fe57233f6355d0989c9
font_02_sfnt_off0000ebed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBED 17016 bytes
SHA-256: cd581e2533c1b5d3941879878808a4c58e2a41dfde35b26a480d61ec57b81445