Malicious PDF — malware analysis report

Static analysis result for SHA-256 28a3bbdc3e1fbe96…

MALICIOUS

PDF

66.8 KB Created: 2021-09-25 18:07:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a24b4614b93fdf5b70afb4a9bb31d86e SHA-1: 11283108eae57b2ed7997d03d6cada41dc09a3d8 SHA-256: 28a3bbdc3e1fbe9630fb340099602e1899d198f639e149f76a7e8fd3dca44da4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and exhibits characteristics of a phishing lure. It contains numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are indicative of a spearphishing attachment, aiming to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4735

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 https://medvor.ru/uplcv?utm_term=minecraft+android+install+mods PDF link annotation
    • http://gapp.fr/medias/files/momedifilipagobuwefak.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/79271271035.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/61353e17481fa.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/satepi.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/xokepupuxagidenamixef.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417db6eefb2---67394969234.pdfIn PDF document text
    • https://mcsfood.com/images/file/97280673524.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/buwixujap.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/57449741538.pdfIn PDF document text
    • https://cet.sk/res/file/xafofixozavemeboza.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/827f30d5038876ffcdcdf7afa8cdb08d/77194341999.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/49201816556.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/4d01602a61c83b5d15466b5b93e55f04/semazufigitulifamisubuf.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/78868475269.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/betanetotoda.pdfIn PDF document text
    • https://chilepools.com/contents/files/makujagomav.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/daad58a8ac91da39e6477c0c2610c4b3/lulubewokapilog.pdfIn PDF document text
    • https://soechi.id/userfiles/file/78645724339.pdfIn PDF document text
    • https://wasael.com/userfiles/file/66621772768.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/24224620361.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/medojesefig.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/jenokebida.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/rivemo.pdfIn 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_off0000aec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC4 10632 bytes
SHA-256: 43e203c168c4d1d0223de1f7159027016857d422d409b442bd307cde704aeb57
font_01_sfnt_off0000c713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC713 16384 bytes
SHA-256: 1644c5aaeb4a183468e7a0482b9685e8ab9d4d97d61ac57544ac3813b65453dc
font_02_sfnt_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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