Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bdd6e37ad1eda8…

MALICIOUS

PDF

87.8 KB Created: 2021-06-27 07:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: d329c24a2733c91055f0182ee51f6a04 SHA-1: ded56d4a70919143895a69d4c32a21f1e4005fae SHA-256: 53bdd6e37ad1eda82cc2a0ed808b3db20adfb0a1b20df024b8d18aac0ceff484
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment

The PDF contains heuristics indicating it is a link farm and a lure for clipboard command execution. The ML classifier strongly suggests maliciousness, and ClamAV also detected it as a phishing trojan. The document body is unreadable, but the heuristics point to a social engineering attack designed to trick the user into executing commands, likely to download and run a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ahxxzx.com/userfiles/202105/file/fobek.pdf In PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/770a7bcc8836fcf3de7bba2d099db1a7/bonurefujupatawerus.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/danewidavodomufisiwodut.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1609849472edd5---85489647236.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb416b7c62---59881341921.pdfIn PDF document text
    • https://orsolyajuhasz.com/ckfinder/userfiles/files/verevamogogubodawirutef.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/7e23f0c1503dcb85d0460e0a5e2b679e/46387211138.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/bdb2994f37ab1fcfb2b5f2dbd7700287/74477494247.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e7b2a8873---2359643000.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76e8292a64---mubaxedewerekeberojojug.pdfIn PDF document text
    • https://talleresimad.com/images/subidas/files/muluzobefovanokefu.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f7d0c5b13---66698368897.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fad3d77762---18134594163.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccb4024182---10912595284.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/87353552333.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/qu5bpocm5vvleolaesg53pq1s3/jufudelulujovitegarusemux.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/rekama.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b559d804eafebc74a41578e6196bf71c/jirisal.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/3554060102.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6e31e3383---83323858058.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1fc1ee2af8ecc2db79e46dab5c11d87f/50818422631.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/2759208095.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/027f966a44df91402bd24a85d58f37ea/niwedoj.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3e7d1ff614588acb936ec0c42eebc8be/taguzovezux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=so+chrome+has+blocked+it+disablePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In 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_off0000f4b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B3 10836 bytes
SHA-256: e1be721524fb37ed0aa53e3a6b2397e87e4409ab163e6cb6c51b60cd4bdfcb3f
font_01_sfnt_off00010db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 16956 bytes
SHA-256: 83d5524ebe8765539a1f8367d5bbef794a00996939b5975284962e7cc5e86132

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