Malicious PDF — malware analysis report

Static analysis result for SHA-256 e11ee388a3ad708e…

MALICIOUS

PDF

73.0 KB Created: 2021-09-27 11:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 54c4133e05a8bca63af36c894f12e990 SHA-1: 497f1ea101e03c85a227d5fab78f34cb1d97ab0c SHA-256: e11ee388a3ad708e03a95251bea24402e4767ecefcc5b347f12458efc66c9ce0
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable domains, suggesting an attempt to redirect users to phishing sites or download further malware. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://ans5680.preneed91.com/upload/files/tonubudefamawupe.pdf In PDF document text
    • http://airmon.hu/images/files/24154287018.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/depodoruf.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/sufezarezume.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mutegukakilovefolokegi.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145aeda03341---84213910180.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6he9g6dlinn1a0kp3m175pmln0/87941428674.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/8422761434.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/78282193169.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/27785139084.pdfIn PDF document text
    • https://777mto.com/contents/files/vijuxevumim.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/161506c05a491c---38106083588.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/wuroginejetakuj.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109170754574803.pdfIn PDF document text
    • http://giasuminhtam.com/Images_upload/files/rilarasuxidojafajejip.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/kozafu.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9358d00fe---21448837445.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210914134951_sd8tt1.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/17976825609.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/54592303687.pdfIn PDF document text
    • https://edex.co/userfiles/files/23563861989.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/9d243d05da48af154a9642d772d89595/tabibedokudupemuse.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/mojus.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/nitefubuwisarapuzi.pdfIn PDF document text
    • http://unionnutritech.com/upload/files/kafekewurovew.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/degosofezevegoxaziwit.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614dea08a1abe---bumuwavobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=how+do+i+create+a+folder+on+my+phonePDF 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_off0000b6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFC 10908 bytes
SHA-256: a9a0879faeb0e0957545f5e8b3c8bf7f3e37fc2b3d03ee2d251abd2cf2a1b115
font_02_sfnt_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 17208 bytes
SHA-256: e57d2ec7c4e523ffc745c98d25d3f729a28811391ec529ef6352af51f5c874e3