Malicious PDF — malware analysis report

Static analysis result for SHA-256 41da8deea2d8fa53…

MALICIOUS

PDF

77.2 KB Created: 2021-09-01 20:58:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6957d5e852c97887b7b796d434fe1428 SHA-1: b52340f798e47e3fce8bbaece38e21490e858fd5 SHA-256: 41da8deea2d8fa53b6a5f3ed06a67ca41b5e475bdaa665496dd9c0accf107489
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous external URIs, with several pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites for phishing or malware delivery. The presence of embedded JavaScript, though not fully analyzed here, further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://artside.org/data/temp/file/kipepezefurogogenotipe.pdf In PDF document text
    • https://gotoko.com/cmsv2/upload/files/kiwoxenafupumupelude.pdfIn PDF document text
    • https://hockeymro.ca/docs/file/zaxawirij.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160854497e4a56---palopapopisavap.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e6b476018---46663920021.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/55285602877.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/72472994343.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/mumikugenifedabisezu.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2a93b821ae85c7b948d44e8568a969d5/xuliwakepafomegesirorub.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a44b1e2b73---54394183625.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/b3570e560d75d06c06611417be0a258c/mekawo.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/g594lkecls9iol7tnkidvv6f9p/vujosatenezalenemuzakas.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16129a84ef386b---wavezenepurofamefabe.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070da290e808---80636620578.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/69739335600.pdfIn PDF document text
    • https://jagominum.com/contents/files/7675510336.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dc5bce629---51982241590.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082582b95267---6615556035.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc5de2f068---88597938224.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/ede8f1b49281df340811be3e702515d5/86722541995.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/8636221113.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=the+polymer+used+in+making+plastic+crockery+isPDF 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_off0000c85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85C 17148 bytes
SHA-256: 3a78659908c3591b664bb926e686efa4a8e988b85a1d0b522208f7cb838fda73
font_01_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 11228 bytes
SHA-256: 8a8009fbdb9edd9e17bf7644a94e15103f00e3dc015905fb322dbd5bbcae1d53

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