Malicious PDF — malware analysis report

Static analysis result for SHA-256 2777e222294e20c4…

MALICIOUS

PDF

77.3 KB Created: 2021-09-02 22:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02c018a390b3e66f5804d579902d0218 SHA-1: 0baa926b3c4bcca09c5e3204a7b158416e500192 SHA-256: 2777e222294e20c4a3bbd746b5d39b96639df7780018fc8ec491c069099e9c61
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with many URLs pointing to websites hosted on compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/a6d6c9f31ad5e39619477f3d2c304d81/suduzovarebudibijorulu.pdf In PDF document text
    • https://408of53crownstreet.com/assets/media/files/53533379882.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/mawopitogejozej.pdfIn PDF document text
    • http://pcccmiennam.com/media/ftp/file/564909527.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210815085455513059.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/fusugegadunow.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/gigobanirupiwegiruf.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/883684dc7021d711d293354b51aa3237/lefisewigixarepiw.pdfIn PDF document text
    • https://daiichigroup.net/uploads/news_file/65770859847.pdfIn PDF document text
    • http://askaudit.ru/price/repagebedolegumabige.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/10434680037.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898be8d4087---15200305813.pdfIn PDF document text
    • https://hopadive.cz/ckfinder/userfiles/files/bopuredej.pdfIn PDF document text
    • http://evolutionchonburi.com/userfiles/files/87326052030.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/wazojepijilukokizadimek.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/99090629150.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/48b17e1a83500f136ff82a8d2c4dbc4f/36134171579.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/73887825244.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8v43562rul14894g1v4l290fl1/rirovamepi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=snl+plummer+block+housings+skf+pdfPDF 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_off0000c7e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E9 17516 bytes
SHA-256: f259361d630b63523e2ef4faefa1845b4e7e0c093b224060051cc27b4780bcf2
font_01_sfnt_off0000f5fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FE 11216 bytes
SHA-256: 3d47b42b2e9ca8b8e3298a4d1c69b3d5aa803e9ea54c7115edc0bb880c34dc59
font_02_sfnt_off00010f89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1