Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8cbb0741582d07…

MALICIOUS

PDF

105.9 KB Created: 2021-07-23 20:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b66296228678eff6b6ce2f8471d27a7a SHA-1: 79131cec85fbfc262c5b8eb5f6211c38d3dc0250 SHA-256: 9b8cbb0741582d07be2ec85a56518e89740dc829cbed3eddca7136ad38e7217f
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress upload directories and other disposable hosting. The 'utm_term' parameter in one URL suggests a redirection scheme. This indicates the file functions as a link farm, likely intended to lead users to phishing pages or download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://motelandratecuci.ro/userfiles/file/48910589386.pdf In PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/0d3aeb5d6ec80d7a5ff26dfc1321cfb5/66414643742.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/xamalibawivenilonajupo.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/mamulalupexukewugaw.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/58549097257.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/92a6kl1abliqha33otd1okcpoc/81979671868.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/1b921b47017ef4180c354d30daf30181/35390051145.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/211650397189.pdfIn PDF document text
    • https://bczenekar.hu/files/file/25620457246.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/a37a188509d4ee93aeff79b2882ed0bd/83804248569.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/pdm5badiebclmdmjld4e6ur2c2/doborabezepegowase.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0af9e87b4---vutufupoxududomib.pdfIn PDF document text
    • http://teerosy.com/ipp/images/uploads/files/sebixawajula.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/efaff9fd810cafb99738e3a9647f7960/68421015575.pdfIn PDF document text
    • http://dental1970.com/clients/5/52/52cfbc2c58cc98a1938bca6351e90795/File/vuselal.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6f310beeca---goripupedibabilemenune.pdfIn PDF document text
    • https://mm-podium.ro/userfiles/file/vokojupezokuja.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/5926498841.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/30693763995.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/dudeniwavezewonuguditan.pdfIn PDF document text
    • http://grupophi.es/uploads/files/59831767805.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca9c842401d---mifafedotazejunokojo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=timex+indiglo+wr+30m+battery+changePDF 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_off000135d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D3 17848 bytes
SHA-256: 658c6110711f5096664645020f26d76e3f52e77b6ac320625c5f28924466b57e
font_01_sfnt_off0001647e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1647E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C95 11348 bytes
SHA-256: 6db6a94fb43e56b6f3e820a0cbaba21bb47cf7e7fc2f1edc4f4daf161c975da3

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