Malicious PDF — malware analysis report

Static analysis result for SHA-256 3128b7bf35d378ae…

MALICIOUS

PDF

70.0 KB Created: 2021-09-17 18:53:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e55f4ea0b280690e5488fcc7b540b96 SHA-1: 1c01bbe18f8b2fc2f4afa5bd2aaaee018bb46cd1 SHA-256: 3128b7bf35d378ae576dc583e1fd323e806b1aeca8b7c0aa049274335a8195a1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is often used to redirect users to malicious sites or exploit vulnerabilities. The PDF also features a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc3e823419---xuned.pdf In PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/71526505471.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/0eu1a5nobrqv63oe4iqt8vndjp/4242919640.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/74261363475.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/91511493292.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/xadawegivaxofek.pdfIn PDF document text
    • https://maviet.vn/upload/files/kukiboxudikeleba.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/3fd470b6066afba9c61076701fe6987d/61139447856.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///93538444077.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/pupisevijefexujogelex.pdfIn PDF document text
    • http://platcometals.com/images/file/91974186495.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/78212320077.pdfIn PDF document text
    • http://autostyle-japan.com/js/upload/files/gazunowase.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/tjdi7c1lp33a84l1js5j5o62d3/ximabulimiwusajoleropekaz.pdfIn PDF document text
    • https://haisanquangninh.org/data/dulieu/files/vitomizugajifitifiwu.pdfIn PDF document text
    • http://kodemari.info/data/files/56485235396.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/98201650133.pdfIn PDF document text
    • http://mannadey.in/FCKeditor/file/gawefenasirudi.pdfIn PDF document text
    • https://grancom.by/upload/docs/juxopefoxuvazifixi.pdfIn PDF document text
    • http://moscowprice.com/content/xuploadimages/file/68909830135.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6fac1eb8b---94373734198.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613460ab38910---seleguze.pdfIn PDF document text
    • http://bora.su/ckfinder/userfiles/files/74934459415.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=game+32+bit+for+pc+windows+7PDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 14980 bytes
SHA-256: 1e0ac65ffe974fb64cbd110871be414d0157d993375306355b68e4a40cc9ed20
font_01_sfnt_off0000d7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7DD 11340 bytes
SHA-256: c2b437c2fc8607998f652cae1ccea5b4f4a0ec3d4d536131330997d05d6a19fa
font_02_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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