Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f6334ec14ad0c1…

MALICIOUS

PDF

88.4 KB Created: 2021-09-03 02:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 47fcada2187110fdf1395f94f076e819 SHA-1: 31d51e78b54dcaaae58113b4a2ebe6e4d6042e31 SHA-256: 42f6334ec14ad0c1056cbe831a6b3a59f0a47deefc133e1d02c00c06a57859fb
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URLs are sufficient to infer a malicious purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://train-in-japan.com/images/blog//file/fidogiwog.pdf In PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f82663d3eb---rizasolojamo.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/161291c67e85ac---35103359205.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb4eeeb0ae---mefizilofutenibawewiz.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/robipap.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/futepufosinuwinevenu.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/mifunoxog.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/6631663949.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/bakado.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/urikdgonf6jvsdvr8c8daolq06/45085946626.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609298ca301de---19709082104.pdfIn PDF document text
    • http://armanetti.com/images/xarebolazadez.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/26725936707.pdfIn PDF document text
    • http://murito.fr/ckfinder/userfiles/files/zusifivumozovuvaxiwe.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/jakisegebatejiregevo.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160b46807be0ad---leludajebikaxiluviwut.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/90002116126.pdfIn PDF document text
    • http://brukbet.com/user_images/file/93125310781.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085f102da4b7---sekunowakupawefevase.pdfIn PDF document text
    • https://mlmrockstars.com/ckfinder/userfiles/files/lipesoliredizazijebo.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/3544800601.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/92df9e0affdec361f3bd9aca4be040b1/samusovunutobeni.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/fixelatiberose.pdfIn PDF document text
    • http://exoticland.bg/upload/files/files/26122346312.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/6057714058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=cateye+padrone+bike+computer+manualPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001068a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068A 19208 bytes
SHA-256: 49ccd46ff865209b695e1e4d1b2a92313e9ba6c2b0f0fec4abb7c9c43ff91129
font_02_sfnt_off0001389f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1389F 10984 bytes
SHA-256: 1e8750a149ff83ef8e07ddcdf8579e8a961a92d60f8b347aa9797ef42b10fb13