Malicious PDF — malware analysis report

Static analysis result for SHA-256 5516303f54e2bc65…

MALICIOUS

PDF

79.7 KB Created: 2021-09-10 11:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a7a1a04ea2902ea33fb4b9670d9f0d03 SHA-1: b642fbdc1120ae0d5966ba30b26ee795794f13ff SHA-256: 5516303f54e2bc65bb2acdd2d1003fc9c62ca607b8c38778ec182c9a94d87833
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV with a phishing and trojan detection. Static analysis reveals it functions as a link farm, with numerous URLs pointing to external sites, some hosted on compromised CMS uploads. The presence of multiple links on disposable hosting and the use of UTM parameters suggest an attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4641

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
  • 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://pierrelemagicien.com/userfiles/file/17535119826.pdf In PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/40387239573.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/27227385767.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/liredunaveperikedawakul.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/8482695258.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/65857906751.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/xebudadaduzila.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/talovatarexerujuvaragun.pdfIn PDF document text
    • http://www.web-globus.de/ckfinder/userfiles/files/nikemudojudugamalubevifed.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/94726146636.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/jopozogeg.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/mugonutemiji.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/sqldfnv1ja9e10rmmj4vsdrtl0/46857544590.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/tajekubobow.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/ziromiromesazebevogiz.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/da52ab085195fe3e3a283f96a6b44182/51661109977.pdfIn PDF document text
    • http://szguilong.com/userfiles/files/lomipuxanafinelevaxabon.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337b7c3077d---82335978290.pdfIn PDF document text
    • https://ms1oke.com/contents/files/boxigujo.pdfIn PDF document text
    • http://beta-rc.com/upload/files/gekejurexumo.pdfIn PDF document text
    • http://malovanesklomh.cz/images/file/71512710092.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/c131859dad07af2f74eeef6a047f6bbe/jomivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=what+does+adb+meanPDF 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_off0000d9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A0 18628 bytes
SHA-256: a13dd7ff0c5104bd31ff95db5be586850af3e8fe9b35695a14f826565f045d47
font_01_sfnt_off00010a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A83 10408 bytes
SHA-256: d9d2efb5c0d8653e4baa763e2d73f9ae0191c73e74b268284a89291496ac5808
font_02_sfnt_off000121ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1