Malicious PDF — malware analysis report

Static analysis result for SHA-256 3258808d8ce91794…

MALICIOUS

PDF

90.4 KB Created: 2021-07-25 04:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a9bf3d8a6e9a73465400e082dbc9be6d SHA-1: e0dc416d5a7d579a3a082dd17200f4ace39ba8f6 SHA-256: 3258808d8ce917949a4d76c2f3557059419f7079e34f839c29f4f2959bd679c2
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://staractivecollection.com/resimler/site/files/64866860085.pdf In PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qu75fh86tt874nouh6dvvejboo/luwawatotepog.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609126f5d7986---jugigomuxalifesi.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/a862d43e2d721cefafd8e5850d770e50/21485523625.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7ca1122a---52737349351.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/kutuputukavajomeke.pdfIn PDF document text
    • http://cathayred-csr.com/img-cathay/files/pufibimemukutoniweveremi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/ee54n22mie2ogsaiq5492i5jc1/pizaxosezowud.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf24293596---38051481913.pdfIn PDF document text
    • http://thedreams.cz/files/jukulidomulez.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b27c02d1f5d---81097361732.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/xebuvanuzumujasemevi.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/6625322950.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16074a44388f97---baselinud.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6ed576091---xevipi.pdfIn PDF document text
    • https://okna-kurska.ru/page_edit/_samples/userfiles/files/jibuvijarafik.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/varivawabopusulelasen.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/filapalojefuvipole.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/lepukogogovubademes.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/45127733084.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/a9332a3344eeb5fb882e2e0b290b3917/16677037041.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/12800687263.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/go3jbe7k5k84h5fuhmdog1foq7/vogufoxidudajazedifepofa.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/m3md4b2uoiig1gtr47upo8j263/fevijirinunesudi.pdfIn PDF document text
    • http://pmteventures.com/clients/5/57/576e8e71b788aac95a268099fab76a3d/File/35029130757.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+make+a+scrolling+platformer+on+scratch+2020PDF 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_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11177 11340 bytes
SHA-256: 1f104f759fbaf5a864f23f3f2955e81d29b04a40df67c7cd5bfa5d9c61dcd192
font_02_sfnt_off00012bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF9 18740 bytes
SHA-256: 35ab586826a1408f290c418550b8dd203c59f692b53f0f6029bf630e48a6d770