Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ac1cab5877d547…

MALICIOUS

PDF

88.5 KB Created: 2021-09-06 19:54:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 960061db80c7a0fe8579cecc8d652a13 SHA-1: 5a08f327d7b4797935ac29db8dc10bb5c7b1019c SHA-256: 36ac1cab5877d547e8a4101af27a6204b059b3edccb10e7a20b02b816e964834
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or are part of link farms, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL analysis are sufficient to infer a phishing or malicious redirection attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://la-klamm.org/Files/files/884568023.pdf In PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6eee3f5cb---41060201868.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/5ba04ba4a35e4620ed6c2bf42eafb0e6/modilobawolawala.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/nozipixetosugadazagagito.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/94101482392.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/gibovowowoxuwegerukal.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/kawufemorepikabudeku.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/wixajufijidalixuralefig.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/55141013282.pdfIn PDF document text
    • http://mxm-hosting.nl/img/editor/file/57588660121.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/1336a1c5a25004b78cc05b4adfa71e69/24164725557.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210824080722183.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb715d9467---89245540279.pdfIn PDF document text
    • http://englishkan.net/UserFiles/File/93223112204.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0aab6bca46277dfafe6b8dd6d249a6c8/96369132229.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/98679831316.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/92652721421.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c7915974c8237500c0929b5be1e0efb7/49368404922.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/damexofisewip.pdfIn PDF document text
    • http://demkapi.com/resimler/files/25204657434.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/10587802738.pdfIn PDF document text
    • https://argumentua.com/i/file/poxapujuguwovigejawirile.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/3b3b057c2a8c127b82feda603d7dec25/sivejegabisulem.pdfIn PDF document text
    • http://veno2.com/upload/sirekerozekakobilodopemuv.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b033083eb8---rajazezizafixesugojiz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=5+day+gym+workout+schedule+pdfPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/surelorulopajudoburenepek.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_off0000f0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E9 11300 bytes
SHA-256: a644ac5050836171b0a8f5a3b55e3a80add6844db1303bb91df529afcac2069d
font_01_sfnt_off00010b67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B67 18624 bytes
SHA-256: b68b0126068514ae3f4d022477ab025cb4a1fea9f0093799207fcd2c8f0c08f8
font_02_sfnt_off00013c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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