Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c686c8c2c92e81b…

MALICIOUS

PDF

186.5 KB Created: 2021-07-03 20:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4d315ea1ab05bb349885dde348499e1b SHA-1: b272e575def350599bbffb8b8a4625d24ae5c4eb SHA-256: 7c686c8c2c92e81bc23d5389f56aa17bf5a83180ed33aea71135b14440e688fd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, a common tactic for distributing malicious content or conducting phishing attacks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of numerous external links on compromised infrastructure is a high-confidence indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9652

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://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/9d14c9fb5800538d1ec3ab61bba967c2/vesilig.pdf In PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/34472017910.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/93503531443.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a779e245c---sifevibadimaxavulegojena.pdfIn PDF document text
    • https://davaocarrental.com/images/file/pemepowegujujutazesem.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/29823630071.pdfIn PDF document text
    • https://hse.tw/upload/file/mopafotaxipidosubozisofu.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/12515785903.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/25e9ca090b5100f2177c680428e88b97/49980790329.pdfIn PDF document text
    • https://bikidi.com/UpFiles/WebEditorFiles/file/52941539761.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160742796514b7---37738029187.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/jijarojojuzujezefifi.pdfIn PDF document text
    • http://omatsuri.kr/data/userfiles/files/javamafegoxiloj.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f41d8121a7e5398e842b20919f919586/51851261237.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608013f694d2e---bitigeduwateda.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/71407791402.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/9l9l0nbg2sllmlim7bu0tnvnom/sejuvulegekabozofipumexi.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/822ff1f97885d9ecfc4e41731c2339dd/74254928235.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094129781de9---79896105827.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/38565719019.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/ruzuxate.pdfIn PDF document text
    • http://www.puhito.hu/uploads/jubimaxatoxurid.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/47810944709.pdfIn PDF document text
    • https://tavio.ru/files/file/40674684331.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/it9hqq10j5skku5fibvloqs77r/perekup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=inventor+3d+printing+softwarePDF link annotation
    • 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_off00026049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00027860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27860 10904 bytes
SHA-256: 45ea363d2d7bebc267db76ad40bf7a88ab65c23020a4396dd73d21a0735f7a7f
font_02_sfnt_off000291a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x291A2 20204 bytes
SHA-256: 314bca66ecd54422e914dbdc8c5c9282075a2daab5df4b46cad8afbcccaba727
font_03_sfnt_off0002c3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C3C0 16392 bytes
SHA-256: ef0cc6e7d46b82340c5d611abc6d5ef62dfb31a25a64485243244449d36d16ea

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