Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2228459cdb32f2…

MALICIOUS

PDF

107.1 KB Created: 2021-08-05 06:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a1611d3b6b0fd451be97ded139d69a58 SHA-1: 8feb5b736a51ddfbd17d30b434a32b8b37c61321 SHA-256: ef2228459cdb32f2f45766e3988b42618df99f334426bad8ec6d5898c838cd38
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that the document is designed to leverage compromised or disposable hosting for malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://avistravel.ro/userfiles/file/kilomevi.pdf In PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/823e45f6a9d780c61d2f9507a57e5dc7/49304725067.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/10241116975.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/gozelufibolebomafadipumer.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/61038862280.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcbf439a99---lujavexugaviwewesuxen.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/xajegedujivimax.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cbe278c99---befokesoruwudirode.pdfIn PDF document text
    • http://citra.cl/userfiles/file/27705509264.pdfIn PDF document text
    • https://vzglavniki.net/data/file/xupodizadilaropojiriz.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad94cad174a---58985690376.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e2bc6b439b4d78befd1c18520361b706/zinelatokunolilax.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087222deb31a---dinusaruwe.pdfIn PDF document text
    • https://marosme.ro/hirek/file/18005826635.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/40028149169.pdfIn PDF document text
    • https://tadimtursu.com/image/files/90731078196.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/timekotakabunuzorofugijom.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/povcf3kkk0h0vkedqm2tpl5g83/77499255769.pdfIn PDF document text
    • http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/tesikifasopodozeretog.pdfIn PDF document text
    • http://xn--54-dlcdkamdj4btild5b.xn--p1ai/ckfinder/userfiles/files/71953858022.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/02f095e2121b6b9a36159a137362d851/66768001261.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f067f2d85---ronarixobow.pdfIn PDF document text
    • http://rosniyom.com/userfiles/files/zugaleri.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/nilonuxadinapekimigor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=calling+all+mixels+google+playPDF 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_off000124a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013cb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CB7 18760 bytes
SHA-256: 7211e600f61414ec7c77fc88684412e523a2e6d068a08b06dac1a6fef0f86362
font_02_sfnt_off00016e5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E5B 10644 bytes
SHA-256: 23cb1e216e4dc950880d13dd0727fcedcb23237e6d10488bf6bab8bf6b8f8878
font_03_sfnt_off000186b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x186B6 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516

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