Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d685fe4fcf3535…

MALICIOUS

PDF

96.7 KB Created: 2021-09-01 18:16:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f7a197ecdfb3308f682168081e028620 SHA-1: e1e315751e50422eb54c15684d1ea3e1ebb23a71 SHA-256: a1d685fe4fcf35358385661d30904aa61ddcd08e0f911184d1d966f23af6ce50
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 WordPress sites and are structured as a link farm. ClamAV detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', and an ML classifier also flagged it as malicious. The presence of these links suggests a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/28f56a2ab0b1bfd6f8bb3efda83fe9bb/27161556878.pdf In PDF document text
    • http://www.allatpatikapecs.hu/images/file/15151289177.pdfIn PDF document text
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/74090375808.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/d589l8fbm6me1ga58oiu3eqi1a/vizam.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/vidax.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/95370aac9c1f2bc78751b76b593f29ce/rewipi.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/4ecf106997af1d0568376223f00f41c7/90670164677.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/zikewomarixewawuxuv.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/23379198208.pdfIn PDF document text
    • https://mvservice.it/file/76910870053.pdfIn PDF document text
    • http://psychanalyste-gard.fr/ckfinder/userfiles/files/buxajavazevedifuririmen.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb7d3c631---79017346135.pdfIn PDF document text
    • http://le383.com/uploads/files/linozevanekaxipilinupozin.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/pilapitatazukidudumi.pdfIn PDF document text
    • https://mytopics.it/uploads/file/81250622670.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/novatoxuwisitibopepe.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/dotupoberofajipipimif.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/piwogusavaxed.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9a7bb6bc40---73985342007.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/xoraxuvexanid.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/8c0f35866011af8da94a19d2f0d8829c/wolakeroperibuma.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/pujepad.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/numutibe.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaaa80694aa---1057850861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=the+cosby+show+hillmanPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B1 10600 bytes
SHA-256: d826185c7817e4e23e60e4a3041e942e150209078426e706d16a1410133d1694
font_01_sfnt_off000121cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000139e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E1 19216 bytes
SHA-256: 72a0ce4dbab01a029b27852f8e771aa58464274788d93f5e01a1bae7a79c11f3
font_03_sfnt_off00016b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5A 1820 bytes
SHA-256: ef4c56b83544acc0eae329b123dcb13384a4443b8ee25b6b011fcec9f25c534c

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