Malicious PDF — malware analysis report

Static analysis result for SHA-256 583a2a2a51d3d2cc…

MALICIOUS

PDF

87.0 KB Created: 2021-07-30 07:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 83c10377e3af72894c442dbb0071cadb SHA-1: 85a4b79210680ca1f837717ff9300342ff04c0cb SHA-256: 583a2a2a51d3d2cc33893ab7c431b0da56d1263d970546f638ed42c9277a1fa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure and embedded links suggest it's designed to lure users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/e69952d00e710c29546e1b7f1b84c0c4/65704105341.pdf
    • http://afgventuregroup.com/cfiles/file/makemupupexika.pdf
    • http://better-pharma.com/images/file/files/37243531016.pdf
    • http://bhk-aindling.com/userfiles/files/54719498510.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbc098da31f---moxibedujusod.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/6f28ed5dd38638cf92dc62608d00f175/zovomalurazonimusa.pdf
    • https://cuisinescartier.ca/upload/editor/file/wosegijetomexenuxeluva.pdf
    • https://augsburger-dartliga.de/uploads/file/51203015856.pdf
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/ee93fa4c03ec2e4f381006a84a3f6eb1/rososuwilaxu.pdf
    • http://clinicaveterinariagussago.com/userfiles/files/worawadisupulakalo.pdf
    • http://wksystems.net/HotelEstimator/userfiles/file/fobepevibonigazavatova.pdf
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/08348488738db29595ac548cdb7a9ae7/67956696764.pdf
    • http://innovad-ltd.com/userfiles/file/tobok.pdf
    • https://fond.ru/userfiles/file/13737329708.pdf
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861de3dba40---87682141357.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/fetevuzuwolemowaw.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e50c053d93c---95278453085.pdf
    • https://kede.org/userfiles/file/25657671140.pdf
    • https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/00920d93e61deb49cf2a1425e4f7f3d4/78761630553.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8afc892e---79090989717.pdf
    • http://techniq.ae/admin/uploadfiles/file/kakorizejaf.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160970be9bd8ed---fikuxiruzibe.pdf
    • https://beatmuellerfoto.ch/userfiles/files/26273355570.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=roblox+scripts+no+download
    • 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_off0000f17e.bin
aac21f4122f7e7bc3e56d059d120f96f9440c4965e590fdc0f2f147d07e5c4db
pdf-font-stream PDF embedded font (sfnt) at offset 0xF17E 10748 bytes
font_01_sfnt_off00010a2f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 16792 bytes
font_02_sfnt_off00012241.bin
c2e669a2fb82b2972e1aaf1c5496e8e008a8c22c2a9464acd07fb7b508543f2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 16760 bytes