Malicious PDF — malware analysis report

Static analysis result for SHA-256 07f5758be8fb4332…

MALICIOUS

PDF

85.9 KB Created: 2021-06-25 13:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df72e453a2f8af42b04188ef8dcfc196 SHA-1: 11a3e9e92203f42128f37dbe4ce30c832c1eeb27 SHA-256: 07f5758be8fb433254ca33956463b5039a4a6ca7d36f37c6af5947cb6521e1dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it functions as a link farm, attempting to lure users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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 http://norilskgu.ru/userfiles/file/gajitovurarujudawabuw.pdf
    • http://copy2d.com/ftp/image/file/wibusedigitemo.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ebqqmffsmnmh7dq87k1fn6bmem/73658590768.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/lozumazuxuxowevet.pdf
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609aaa8bbe512---50682978613.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/058a0282c75c963396f78e4a34e63b41/57890155235.pdf
    • http://feynburg-uhren.de/uploads/6630113897.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794a7e96ad0---42787193255.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070605e4236e---kumubobezexipub.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160731c784796e---lugojejinesolagetu.pdf
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/9e8dab5df0d786af59afe9453dd366b9/rixuxotuzanus.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160897003b4d1c---94658908865.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a78985d8242---mewuko.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d935904e10---wutetizu.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac69c49ff8e---kasevudizaruva.pdf
    • https://ibeguiristain.com/userfiles/files/453245412.pdf
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757440947a8---72648761506.pdf
    • http://rauvuonsach.com/images/uploads/files/vavipuxovunu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=how+reading+changed+my+life+anna+quindlen+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eae0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 16792 bytes
font_01_sfnt_off000102f2.bin
440d67df4213aeb37e1fd8b9ae5350a5a1cdaa35045de9d1f2a06a1a6b2828d9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102F2 17040 bytes
font_02_sfnt_off00012f6a.bin
9318cb27520efe0d6dd8af38fd60f4525354815b3a4b88ec626788e237426739
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6A 11236 bytes