Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e7776447131217…

MALICIOUS

PDF

82.7 KB Created: 2021-06-26 07:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbe3890a9880fba8e8f32ac4105e824a SHA-1: 207e66da548d9abe25970dd18d008fa74b56ff4d SHA-256: f1e77764471312170146993ac019e7e9c6311356170adb31dc536826836a19c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites, likely to host phishing content or further malware. The presence of embedded URLs and the nature of the heuristic firings strongly suggest a phishing or credential harvesting attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160749fa2dac6a---73997417594.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0c4ad790ba---fokofemodipumotediwofun.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3cd249fce0b5e1575e03d3454d85f36f/refisozoserenapagur.pdf
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609847020a390---96172534260.pdf
    • http://csc0516.com/userfiles/file/20210614133627_azhamk.pdf
    • http://stalmost.pl/userfiles/file/75526761958.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160987d25a3142---83346765497.pdf
    • http://ithaca1962.com/clients/41687/File/36322081646.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/6b8af4baea2ff1cd9d60d83126404935/56422600984.pdf
    • http://manixcnc.com/ckupload/files/43951740142.pdf
    • http://architettoseneca.com/userfiles/files/47118448318.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ebf3889d6f49ae6a7e6fba44d272fc84/jumuvizubisagikutefikuwu.pdf
    • http://elyriahigh1974.org/clients/0/05/052ab20d644b737728595af1a47b4450/File/42218096816.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8be2a5059---92270691377.pdf
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/k3o83vl3ddgq8akf02ls8frodd/94632753185.pdf
    • https://artbynela.com/uploads/file/35275305650.pdf
    • http://akinmedical.com/uploads/file/lulifagezenanoton.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c07b4c7099---wawuxodinojagapezosaxe.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072e9ee352ad---47228609267.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a39ee3027d4---52971854906.pdf
    • https://bojovicsirogojno.com//files/jetosixarupumi.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0fa05349c---6198984994.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/535271213016e799493668b2f28caa62/xawuzuso.pdf
    • http://www.contectrade.hu/fckfiles/file/fivoberawefododezozuwom.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/02e061c5153c12bf2ca0711a373d28f3/kovewidemum.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+do+i+write+a+personal+reference
    • 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_off0000df85.bin
bd9bfcbc84ab237583a3ad8a29caa15a31ccbfcba38d164dddb2758cbc9ea441
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF85 16688 bytes
font_01_sfnt_off00010ac1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 16792 bytes
font_02_sfnt_off000122d8.bin
f90a2b6202ec40373119c72877d73bba69fb325fb3d18cf6d85a21b91760eb9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 10688 bytes