Malicious PDF — malware analysis report

Static analysis result for SHA-256 336c97cfa024e4f1…

MALICIOUS

PDF

95.2 KB Created: 2021-09-07 05:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cd56d11d3ff3ccd3f440ed501c6dc9d3 SHA-1: 3b4c91cea9c6a76ed2dcfe307574f782ad86bf0b SHA-256: 336c97cfa024e4f123efc260660615cb1b20b88e244982b5e21fd6aaccdb9088
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. Additionally, the document exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting. These elements suggest the PDF is designed to lure users to malicious sites, likely for phishing or to download further malware, as indicated by the ClamAV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=rabindranath+tagore+biography+pdf+free+download PDF link annotation
    • https://spheresignal.com/app/webroot/userfiles/files/51496973706.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aff50014d2e---gosalisikam.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/fb38fa8b6tv4t2f7n60oe4cac7/32470109303.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363457da6f0---68235182679.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210529222311101.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/dibak.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/49715355072.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/8e8b54d01b9531b7412bb5de5d4dff9d/ralikizodiduzugegovera.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/396511bd5de7ecb98c1aa8d33cafdd70/7936448676.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/74c78f5ad003c0006ffc8ba63c66165c/namej.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/07808e264e79d56fe588340e250f3f31/91199488439.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/40152188161.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce4d6b25376---lewubiru.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc03233ed4---72908318259.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/58661406591.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/250dcfccbb5e5e963fc61f1bede35469/roredozef.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/gewolixatetega.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/sp0c4vmhj4gum0p9s6rh7mf7s1/fanakunaw.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608d83b8b5b68---lupikitipomubi.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/lamusatenesewegixi.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/964bf65c21419d82fbfe0cb23f0ff3f6/75808779488.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/3f9b18ccc1278ff210cdbfc6369e7fdd/kusav.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/67728754856.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_off00010a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A0F 10992 bytes
SHA-256: 521ae86595d61b6e10e5a9c3d336023e80fdee1162ee23b72ab7674500406c3c
font_01_sfnt_off00012327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12327 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B39 19604 bytes
SHA-256: c4b0bbee984630359f8ad6ffa5461fcc7273d237b0b4161422a72180a953d2bb

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