Malicious PDF — malware analysis report

Static analysis result for SHA-256 157fa530f3d55700…

MALICIOUS

PDF

104.0 KB Created: 2021-08-26 12:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 824cfdc506bccf2d529f9b1b09f93bf1 SHA-1: 6f54f1ba373d1768b56e1988963cf215eb05c348 SHA-256: 157fa530f3d557006bdf6322985616462e909f61de307fff16c3ee7a8d55e162
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV both flagged this file as malicious, indicating a high likelihood of it being used for phishing or distributing further malware. The embedded links suggest an attempt to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9536

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
  • 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://ayurvedicclinic.org/userfiles/file/xixewox.pdf In PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/furujapuvuxenamozupowukav.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/582464ab2be9c151f5396941dcaa7d47/xememivoxeda.pdfIn PDF document text
    • http://francisfamilyreunion.net/clients/870293/File/xoxeturadotudatakuwixofo.pdfIn PDF document text
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/36600918472.pdfIn PDF document text
    • http://loaamtran.vn/files/usersfiles/files/numolupokerujanabi.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/ec693bbd7dcd256bf36cc1e0dc63f545/5175362992.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/robudutaripopo.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/54b07c7b28a6ac39021e3c871db55db8/37267093189.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/bt4mfv07afmd19csucg9n1ceu1/92963355899.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/84155539059.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/davokuwod.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160f431232fec7---samuwofutirowikat.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/11705443101.pdfIn PDF document text
    • https://marigabung.com/contents//files/20756148338.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/xajugasipejejigavixiw.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a24ee4293---74520792827.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a48659950---limejupoledezoniravawalo.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/xizopusidupovoguma.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/titovevubesozo.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be9f97ced22---26606251797.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=wirehaired+griffon+rescuePDF 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_off00013d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00015569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15569 17316 bytes
SHA-256: 4694dbf6e267c1277f47b1ac588fdb419e50d659c48915cdf1fa8913740af0e4
font_02_sfnt_off0001828f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1828F 10704 bytes
SHA-256: c104b3c2b85138bc494df0898391c1454bc103801b7e3d8d9d94a03c5ea2a359