Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af3fd98e10b8c1b…

MALICIOUS

PDF

87.9 KB Created: 2021-07-03 23:51:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 91b4e0ed41e9b9526ff303d5ed7599f4 SHA-1: 917d82d3258ade8322b8df3066fd5f5cb41a5c97 SHA-256: 8af3fd98e10b8c1b77cb30b576e7734b8d03183f159b7b2b44457564433d0ad5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised websites, including WordPress upload directories. These links likely serve to distribute further malware or facilitate phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://smidgel.ru/uplcv?utm_term=write+the+equation+of+a+parabola+with+focus+and+directrix PDF link annotation
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/0855854d67cacff00a371b84349ebe2e/14076107818.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/kegowujebefajomuw.pdfIn PDF document text
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/a378b6a785b27ec17c858cb042107c5d/12266082621.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/fisebebiruwifusapuv.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16078e3ed9c5f1---tozojatedizejijekab.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/es9c9o6qk6aiiisi38qem3pifr/finotutuxexokabepimif.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c55b734b8e---mofavegofijixafaf.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/pijobelo.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/df859cdf5810d1309924433aff725945/68039128178.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58dcac7a4760703b4a051ba05e04f334/wolitugowibebiwa.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/0ovnl3j1hn4i148keo83hkglmd/74604217085.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/fidewaseralef.pdfIn PDF document text
    • https://amblamy.ee/upload/file/18200288207.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c3cc2e595---palafewogowupamibomebama.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/19756854016.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acd97e8c8b8---40310391124.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d554a6ba9b---lixupapob.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/65700456958.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160b3803c5b779---maverilutoj.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/18868683049.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/95876213047.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608288aea6f1e---tilijapemusukonitakavitu.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/nifoma.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 16656 bytes
SHA-256: 60ae110f799ea7204d221312839e006646ddc49d3d4f0e5a698f279463a94c04
font_01_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137FF 11284 bytes
SHA-256: 51435f89a9908e6d7cb428502564abcd97c612982a59570cac43511875cdaad3

Open this report in the interactive analyzer, or submit your own file for analysis.