Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d8d2f0c5eee14cb…

MALICIOUS

PDF

75.6 KB Created: 2021-09-03 11:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f1d794498a80d4c813f0e668136c33af SHA-1: d792dbb8caf6654d01395a0f270a43c9086a0db6 SHA-256: 3d8d2f0c5eee14cb0621e714106a461ee5f5da110769b43b468ffd45d28ad290
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect the user. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware delivery campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5732

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=two-dimensional+shapes+worksheets+for+kindergarten
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e984e6edec3---nuvopar.pdf
    • http://greatwalledmond.com/ckfinder/userfiles/files/82546000604.pdf
    • https://moolans.com/uploads/files/39242186507.pdf
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7d53903de---7848246.pdf
    • http://matraholding.hu/images/userfiles/files/80026667511.pdf
    • http://ttc-investco.com/img/files/12066327237.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1f42f539a889f3cad22cb8409f9b80bf/50850236342.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a35dfcca16e2e97eb554772c6812af83/kolezube.pdf
    • http://lorichphoto.com/pictures/file/42586592094.pdf
    • http://sp3siemianowice.pl/userFiles/files/bisomajelepibonujepi.pdf
    • https://mkycc4.com/kycc4.com/userfiles/files/22663956381.pdf
    • https://arnetbilgisayar.com/upload/ckfinder/files/joxexo.pdf
    • http://prasongp.com/file_media/file_image/file/89594308881.pdf
    • http://hydrogears.com/survey/userfiles/files/43278599189.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/55682832653.pdf
    • http://spalovnachemolak.sk/userfiles/file/54535921141.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/dafad10994e25f55644bccebf834d19e/53329363068.pdf
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d27ef7eda3bde5d7cb7d49ad123a4ea6/lefaburolidilemi.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/repikinenurofifem.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/s8s9attf45opnnhlbs67a3qqv3/bogokevuwivonivewejexam.pdf
    • https://dadrarad.ro/userfiles/file/wesudedi.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5a2.bin
fca81be93cfbf57ea87148d3003c6bbe5ec338342fbe2f6028ccb5a70f3f8732		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A2 17348 bytes
font_01_sfnt_off0001027b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1027B 16792 bytes

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