Malicious PDF — malware analysis report

Static analysis result for SHA-256 2416ddffe06f8e17…

MALICIOUS

PDF

108.6 KB Created: 2021-08-23 18:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0677405b1d1f3e484566033630187986 SHA-1: f3a0754789cf69e2cae5d0377521f94ac0213b5e SHA-256: 2416ddffe06f8e17639aa0ac78d5a411fd24f8b7f1e8a2dcfef6103f912038fc
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. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/09d3e3aa2d1723ce5e642dc1a62af961/duxizobosimela.pdf In PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b5769c64249---53723827345.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/7230863200.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/zujip.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8afe445ca---bajebofuga.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/rizanujul.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/lebimawakij.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607885bf352ce---9949254257.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/diviluvarawebi.pdfIn PDF document text
    • http://artstudiodesign.it/userfiles/files/mikujujedomamuxuse.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/popubozajupadupodarebek.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/uupje9kp6cnlk0tcoh91anojra/sonutinumazozomon.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b663ec05bfb1abb3e8740eb116b56e4f/sozuz.pdfIn PDF document text
    • http://ipllaser.in/uploads/61561418633.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/aad54bd18a047461b66a0db6da3e12cc/17677164165.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/s58q1fdov5amns1b0djunvjam9/norarobuxotafugowil.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/madus.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/56068433440.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/welebogamafunorele.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/06f0d11dc69d76d2e8a7b51bc2044f22/86467438274.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/3513184957.pdfIn PDF document text
    • http://saptpadi.com/files/file/dekasidutedume.pdfIn PDF document text
    • https://breedlife.com/upload/files/37413827056.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/msukh0c0c08oh3ons98p1lm5c4/92980506681.pdfIn PDF document text
    • https://nergizleryapi.com/image/files/93579066978.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=sw+asia+physical+mapPDF 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_off000144d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144D7 18700 bytes
SHA-256: 434acc65571218f53130d6334d0b0a8bbff062ed3dfe1fbf25af1029068a79ba
font_01_sfnt_off00017491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17491 10360 bytes
SHA-256: b65a3e39e64c4d2dd7edf42781716263e68ed1654dc21ba4ee2ff43b859ce5fb
font_02_sfnt_off00018bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1