Malicious PDF — malware analysis report

Static analysis result for SHA-256 19fcf01f8319134d…

MALICIOUS

PDF

98.5 KB Created: 2021-07-06 21:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6660e380318bd4102592fedc06928d2a SHA-1: 007160502f49afbfa85542a416b96792c0edf8b6 SHA-256: 19fcf01f8319134db0e7f156381399c8ee72b97099362661876c7f5d77722035
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest a phishing or trojan payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents used for initial access via phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://crysiq.ru/uplcv?utm_term=warframe+how+to+get+frost+parts
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/hs4am1rgv858m8ha49ghd67o1c/fikulovimipararimadelo.pdf
    • https://diphong.com/uploads/66222358508.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aea90aa97c---39463031715.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20b1a29c3---ruworaletorabos.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/2ba7e14bc3112590e9009ffc29a7a566/wudutuwafuwujuxekodavira.pdf
    • http://bright-mineral.com/uploadfile/file/2021061717015778.pdf
    • http://consulcongress.it/uploads/assets/file/5524728493.pdf
    • http://cdmatik.com/uploads/file/15098023470.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4803a165e---sisotego.pdf
    • http://parkhighclassof60.com/clients/871169/File/86517379138.pdf
    • http://halongbaycruises.org/upload/files/gudenis.pdf
    • http://conblocmanado.com/pics/file/10992420730.pdf
    • https://biocoils.com/img/file/rigimubidemajuwomedol.pdf
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/88358d4677bcc2e467199565142c49a9/65223122527.pdf
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/18c2efa72e7a0f6c4d0b04e29d5b47e6/56383035395.pdf
    • http://kmsenior.org/file/files/46863042250.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca57112c5e---22814194988.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5df9d18f6---sogasapumapamodagajelupis.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/527bc224328eb00660650f1362f5e2e6/42046430091.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85ba0e668f---71288877236.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/fa304131267628be8008f7bdd3d8478d/tirogazekalatunibe.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160704a1ae39cd---51558876103.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/22c0d73cf362b9adc349d019af9f8ca6/jiropavud.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b9462b59d---42206993999.pdf
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9414690bf---zitisawenu.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_off00011f87.bin
65b4ac6d5128267234636794e70cbe9324d706967a2c12f90c7ef7f6fbb89eae
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F87 10640 bytes
font_01_sfnt_off000137fd.bin
434906fb225bb2898d851fadc1e22a33943ea64baed219bfdc59fdbb8bccf1d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x137FD 17104 bytes
font_02_sfnt_off0001649d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1649D 16792 bytes