Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6a281541beb759b…

MALICIOUS

PDF

175.1 KB Created: 2021-07-15 23:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dc5a2ffa771989d16dfaed2db12def75 SHA-1: 93144effbd9c041773312b7d713bc603f2f2a36c SHA-256: a6a281541beb759b453d68e41c3645e71080ce033aee8623b1b8393e31e94670
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it's designed to redirect users to potentially malicious websites. The presence of compromised CMS upload links and the ML classifier's high confidence score further support its malicious nature, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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://smidgel.ru/uplcv?utm_term=algebra+1+chapter+10+practice+workbook+answers PDF link annotation
    • https://bahispesinde.com/gnc/veri/_files/judiz.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/mirow.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/domonidimawid.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b38c8b0f1---50984905909.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/f5848d34c59c938295d77e58dac93dda/52808363098.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ilmp1emocpij9afhqf50ld4783/33412288415.pdfIn PDF document text
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/0510ec17f0b24ab51cd8059ec9e83511/ropagoxawirigaromof.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/52162779955.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072c64424620---zulewifinixa.pdfIn PDF document text
    • http://vinmexindia.com/uploads/wekimiwuz.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c54f9875b3c---jewodixinipumupatuzotu.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be390935d90---koseriluvo.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096a0a72fa90---71452710215.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa31b9936e3---mukodapudewidalu.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2acd23d4a---jegebinajituxixemidijiv.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/samamuwojaguja.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/b07a59827430492a63c8e458410edf05/72939922742.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/d9f6d8e518faec39cce6a311ad857f0e/5131782557.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/55990545567.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/22ae5ba44981d54ca68f14922885d8c5/15143839469.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d02f7da06---vugafiliv.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac6641a03b---42658926516.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/56503193457.pdfIn PDF document text
    • https://unique-u.biz/images/uploads/file/20513929061.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002302d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2302D 11124 bytes
SHA-256: 57c163c0980ee51c747cfb2af68507b463fdf8c0f5117c1dbff86f46003f2b36
font_01_sfnt_off000249fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x249FC 18424 bytes
SHA-256: 77244a6ddce2e737655939ba5049eb28178f7d6ac6c42f2243599ee839fc6602
font_02_sfnt_off00027abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27ABD 17528 bytes
SHA-256: 66a37b2e6f3dec67c150f039fca7bfdf60ccfe92cfa59319a2ab365d466ef935
font_03_sfnt_off00029597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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