Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79b217a831936cf…

MALICIOUS

PDF

74.6 KB Created: 2021-07-19 01:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 45085f3512c21bd9daba6c883e03d6bd SHA-1: 4d13ada95d6b97b2426921a9821d23343f6d4b8f SHA-256: e79b217a831936cf88ff6af7ea2a8d76584c8e85544150513ded3572753e2cf5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to numerous compromised websites and other PDF files, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The primary function appears to be directing users to potentially harmful content hosted on compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6148

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://gokea.org/upload/editor/files/kesusogubarizesowopevufiz.pdf In PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/trcnkerb8vj4tt91oulc871s82/ziratovuriditumatujato.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ba76bf810da---78491969653.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/4fb62c527e48a9cdc9e4e61cce6a7e91/8356180816.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/zazefu.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/tamadapiwobopilofebuz.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/duxitosegije.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/83200073058.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/lilixirivapobuwiw.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608722ab47082---digog.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/fozarimalubevone.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/98577521848.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/lesalufimerububinikojen.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/lefiponotusafuxotadi.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5bbec5dae7659414f8e85fd0ce03306/sixoju.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/88360602260.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a546b896290---46347117289.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c02c574998e3a433616a6557b8d0619f/lerisonolikoxefipuk.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/iodble3fo12rqfbbll4qn1c975/63280716774.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/36593658174.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/9de2a55a28fc68fafe3a1d748d3eac27/mawejakumoxugexikogesadu.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fdc69295bc---75439392158.pdfIn PDF document text
    • https://dineflon.com//files/43136488611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=stochastic+models+in+queueing+theoryPDF link annotation
    • 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_off0000caeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FD 16692 bytes
SHA-256: 7cec0fff146602c29a7426243692dfc868dadd798ebf894399712eda8eafc45f
font_02_sfnt_off00010e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E07 11252 bytes
SHA-256: 50bf6121a336ff2d957d516338cfe97426b8a8137774c3691d36dd9845616998