Malicious PDF — malware analysis report

Static analysis result for SHA-256 9332e95552bd786b…

MALICIOUS

PDF

78.5 KB Created: 2021-09-09 16:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dcccdc32b8f9129490f085b149449e8d SHA-1: c41a94af049ee673003552cafea17f32d997293a SHA-256: 9332e95552bd786b3dfc9760fd307050ca9e29749bd6fe2ece65527cac0ae3a4
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on domains that appear to be compromised or disposable. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using these sites to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://isigakizima.net/img/tmp/file/sozixowaxezuvuvososu.pdf In PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/remozifenodamok.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/fomenavexovopasukiwisa.pdfIn PDF document text
    • http://gardatrans.com/content/Files/ritalupivegemik.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/48622464641.pdfIn PDF document text
    • http://preciz.com/uploads/wysiwyg/files/12284683617.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/62765904008.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/52046479754.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/pagowov.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/riwuwumunuv.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161326249131d5---8851665016.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/812593600.pdfIn PDF document text
    • http://ihdbd.org/upload/files/58556415069.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/fupalofopopupeniw.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/nugikokofofetutiwakazove.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/20806308509.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/kefilutodup.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/nilabufovokolev.pdfIn PDF document text
    • http://stonestudio.pl/files/upload/file/kadogowivufolesazolob.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210904072429323417s68kkcbfcfue.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/40757854554.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16135ea546561a---suleguparevuragowo.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bb77454c3819fafb45a2e83a4d885440/wejulaxesolegujaxozajopix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=jine+mera+dil+luteya+full+movie+watch+onlinePDF 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_off0000c96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e17c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17C 19488 bytes
SHA-256: ddb064a77b2f3e4c36a7e60d9ff79db994c157ac80ed85084f97ec57eee55201
font_02_sfnt_off000112e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E3 10932 bytes
SHA-256: 2f1ed22c18c208455a6cc0c67eede50e7ab714ac34d02a22c7d4a8cd4a8a412f

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