Malicious PDF — malware analysis report

Static analysis result for SHA-256 5da4506c8f9a4e01…

MALICIOUS

PDF

82.2 KB Created: 2021-09-04 22:03:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 68437d1699903ebae5d3d41d50ce5e0e SHA-1: fa6fbda0c38fe06e020e5a04442ab7422c36d16b SHA-256: 5da4506c8f9a4e014c7c226a3fbd6734677a897241fc06a710773923d0da734a
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, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9762

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://allytemp.ru/uplcv?utm_term=bernette+b79+manual PDF link annotation
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/3556628ce95ca4c9b2debeff2b6a5e6e/pevukifule.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/25019748616.pdfIn PDF document text
    • https://tangentemag.com/img/file/jedizajevubezenirurefoles.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae5a0107b6---86175258056.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/resitonivudaraligobudiwa.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/famejodedamivazenemave.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/88941280493.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b734ebb1551---68662083050.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/hoq0cjfv486fhaicbabme923g4/83782111353.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fba4b79cbb---dokuwesarakozepiza.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/6663713165.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/76723665290.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b21477d944e2694454d39ace96b5fe32/fukutatitunozanojeram.pdfIn PDF document text
    • http://medrea.ru/upload/files/lopanosutemomakanog.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/sefileku.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a84277282e7---dijuvirebiwuwomosefepeguj.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/disixodokuwugexoveladot.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160785fd8244f8---1096705475.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/42233361247.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210601235252.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7db5a4791f---xafawirazabenowaja.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada5649eec---79810489350.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/b28ff74a46ca07168fe9b1fda20a13d6/lefokititose.pdfIn PDF document text
    • http://lhjmfamily.com/clients/5/5d/5d8645f74963a96e1aea25f3b610eff6/File/xavibepekaduwirezolubege.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/55635446158.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/71140241940.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/bvhmuiktf2pmqkujg2uf70s0vh/davapekudegugivowidim.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD835 10400 bytes
SHA-256: 9415bd255d61c920f2c3cfc297157785d150d09b3e63101a209376aa4fa1f1c2
font_02_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 16404 bytes
SHA-256: b6535a6cf817cdad640e5465cf8bfa6acf4cb79addf97afd681b6d2bc1688ee7
font_03_sfnt_off0001068c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068C 20848 bytes
SHA-256: e92d10c6cdd627da80029ca33a2b79035c711f28887e3a45ba8eaf1dde27ed1b

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