Malicious PDF — malware analysis report

Static analysis result for SHA-256 56891815a5f0ab34…

MALICIOUS

PDF

81.7 KB Created: 2021-09-21 00:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b9279b3944d98de26217b244d187c20c SHA-1: 2e964b68fed755a2e7ff97c490b9a791ba6873e3 SHA-256: 56891815a5f0ab340cc282f7f1e49e42b1e18179ceb49d724341f1b79c4f5db4
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://artc-polymers.com/upload/images/files/zetuwopefunomexunodogibax.pdf In PDF document text
    • https://avukat.dnsaktif.net/upload/files/nanetoru.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/56876491421.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210907104951.pdfIn PDF document text
    • http://net-work.cz/data/file/giwarixewitadabavinukipak.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac6b7ca96---wezorumiruvaz.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/vuzeg.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/tekepurapulowenuk.pdfIn PDF document text
    • http://espicycooking.com/files/file///neworomoboruwibisij.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f621269e7f---79398256360.pdfIn PDF document text
    • http://prospekt-rostov.ru/ckfinder/userfiles/files/84448664443.pdfIn PDF document text
    • https://u15.ch/ckfinder/userfiles/files/xekawazidulefope.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/44219697413.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/18569137838.pdfIn PDF document text
    • https://cytairtool.com/test/userfiles/file/20210901_044b7.pdfIn PDF document text
    • http://kriosispl.com/cote_dor_import/admin/ckfinder/userfiles/files/63486747277.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/98191346525.pdfIn PDF document text
    • http://blekinge.boj.se/uploads/userfiles/files/xemiwa.pdfIn PDF document text
    • http://ccshecea.org/upload/files/23912330474.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219182151336172.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/6663740161.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/lavamujer.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/gumut.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/77726632450.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/55f6b61e1ff9be457bd2503c411efbe5/gotekagasap.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132668d50e9d---63660147461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=download+apk+slowmo+iphonePDF 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_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 18336 bytes
SHA-256: e0eb6f6cf2aaf8a644f41467ddee91cf5c24b4ad2599b0a71213ca18fd8f8792
font_01_sfnt_off0001089e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089E 10640 bytes
SHA-256: 75f4dbe2a88da1612a4b5a8ee3460d937bf9e1f4898bc9bdbffa4b8c92944090
font_02_sfnt_off000120c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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