Malicious PDF — malware analysis report

Static analysis result for SHA-256 29c6a340d05b006d…

MALICIOUS

PDF

96.4 KB Created: 2021-09-06 03:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7cf179836f835e55021a08b18b0dbd15 SHA-1: f9d92e0186677f7ccef2818558376d7bd08fe639 SHA-256: 29c6a340d05b006de8ec42a31e28fca70b976f0bc9685615f16df75e0bc71491
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also features a large number of external links, many hosted on compromised websites or disposable domains, suggesting a phishing or credential harvesting attempt. The embedded JavaScript likely serves to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=anycubic+kossel+user+manual+deutsch PDF link annotation
    • http://huonglonghotel.com/uploads/image/files/15566270868.pdfIn PDF document text
    • http://pazzo.jp/js/upload/files/bosumemed.pdfIn PDF document text
    • http://55thocscompany.com/clients/62662/File/91746620727.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160f1673a648bd---22832071649.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772661a9583---50691568936.pdfIn PDF document text
    • http://minhvuongthuphap.com/upload/ck/files/xunujebajovuxuji.pdfIn PDF document text
    • http://boletin.alicantehosteleria.com/lib/ckfinder/userfiles/files/sapilitutarusokenulodup.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/nanagabiropukomijuzosemi.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/241f87b007d0653b905b52138b1cc91f/nitajixamutataj.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/c7h7h39q57n7chcmggnlekdmn0/56459288597.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6b3a7cf0ff56ac922f2f3b093e4e3d61/9798061747.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/nulizowo.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/6e189cf1ebfd50968843bc00bcfc4096/41429054967.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/714901851.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/revisemeredeb.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/9ddb96107ec58cfc088f600b16cf3115/norijuwosulanam.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/xakitoduvubupirik.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/08b98857926f40f131716107fe715b99/77881252300.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be047149074---35384629193.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/45464428914.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/modukilixezogixidedi.pdfIn PDF document text
    • https://losaltos.com/wysiwygfiles/file/lemenitojusagabak.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611641ddc4f9f---mivebore.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/43406157371.pdfIn PDF document text
    • http://18554080.com/userfiles/file/befifibedogojewibisibin.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7aa8ef89f---11591245282.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 11064 bytes
SHA-256: 43108ad145db64f09f8954374d93ff32dd83b61323fe6c8030e7c9fb4e3988b5
font_01_sfnt_off00012b8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000143a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A1 18600 bytes
SHA-256: 280a6f3e4231b132334fc69d8b4f31d2154d9074ceb2caac2b64cd6b019046a6

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