Malicious PDF — malware analysis report

Static analysis result for SHA-256 92e3a697cfec3e36…

MALICIOUS

PDF

81.2 KB Created: 2021-09-30 20:02:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b884c017cbc5cdc07111910bd4ef3e5a SHA-1: 271a531cf899106d77753fb826eb40a131789ce2 SHA-256: 92e3a697cfec3e36c5ea61ffb03d99323ab3071f11a87f07f6fbbcdd50a3ca35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a phishing or malware distribution lure. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or serving a malicious payload.

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 https://infrive.ru/uplcv?utm_term=friv+multiplayer+games PDF link annotation
    • http://bolt.fo/public_html/userfiles/files/55051658402.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/33016109220.pdfIn PDF document text
    • http://beiwendq.com/data/attachment/file/fubugalifinadikudefufibub.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615087c53441e---24680973612.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/42900798461.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/ramiset.pdfIn PDF document text
    • https://maytinhdalat.vn/images/uploads/files/xegamudizixujisufi.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/13480320702.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/26603800311.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/tebizenidekeripavokaxe.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/mimalafopoxofisej.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1614638214a6ce---81838087617.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/vodusesadibalekotuwe.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1614d1b6e38319---85185484586.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/lozibomokuzagezosuja.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210929184507.pdfIn PDF document text
    • https://marwaservicecenter.com/nbloom/fckuploads/file/zarojexupilomenab.pdfIn PDF document text
    • https://km2804.com/ckupload/files/xozoxoxesu.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153f98e8949c---novedokoje.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/97698090985.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/samoluwunumomefolibe.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/45916570300.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7a5a5c598---sifedatomibuvexutiw.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/24100082277.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/zaraligaxerodadoberaladeg.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_off0000cafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFC 22848 bytes
SHA-256: f23f16152884fc2d852d3ef748c2de7afd65676c7cd30874ab92ae33b762cfc3
font_01_sfnt_off000106c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C2 10628 bytes
SHA-256: 472bf4db788c305229033dacb723ecdbafbbea898201839e3ba7017668f74fb0
font_02_sfnt_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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