Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1f713ac5bc623fd…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 12:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5403e1174a5d1c096a01f1c62134c439 SHA-1: bd45ae81434f637cbae600a4859829f0278267be SHA-256: c1f713ac5bc623fdb2699287b7860a6a54e09db98f52d720afa2f354e9f287f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wastran.ru/uplcv?utm_term=what+version+of+android+do+i+have PDF link annotation
    • http://tomei4x4.jp/js/upload/files/99357962686.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/topuzaxonixojadev.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210909175403_4urkk3.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/59771281342.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16140ba590ca50---sepagubifut.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/zutusimajikajiditinavota.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/pelilojomozovizawofibijaw.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f60b8f8a3---35283390347.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/33848461393.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/18807685735.pdfIn PDF document text
    • https://stonebuild.bg/f/uploads/files/438952620.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/sefegete.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/tufozutidem.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614366fad0fd4---30931621060.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/69764481100.pdfIn PDF document text
    • http://tiquital.com/documentos/file/99645495685.pdfIn PDF document text
    • http://wohingltd.com/userfiles/47205517728.pdfIn PDF document text
    • https://makenie.com/upload/files/67469244566.pdfIn PDF document text
    • http://clevio.biz/fckUpload/file/25838236444.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/fufisurizepulinuva.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/nebolelozodijotekeni.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/fasuvak.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/sesolesevosuvuzet.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/pumefesajuwu.pdfIn PDF document text
    • http://i-dron.cz/data/file/7674712967.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/40326278359.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_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 10464 bytes
SHA-256: 0c4955f20cc20b5ecc9ae15607641dbae71c5fe469f9f050f19f974a948219fc
font_01_sfnt_off0000f4bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCD 18140 bytes
SHA-256: 3ac3357c53418da5af3df3dbc6ee83e60fa42a8f572fb1c399f07f8f25e17b27

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