Malicious PDF — malware analysis report

Static analysis result for SHA-256 368c71378afec656…

MALICIOUS

PDF

69.8 KB Created: 2021-09-06 21:37:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8c95ce7757ed6f332f1126f3f5f56d01 SHA-1: 0ccd5d2f111418439ad9f4d934988ecac0a83ee1 SHA-256: 368c71378afec656c732845dc40331fc89eb669e513139e77fd90bc471657032
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/9a939e511067c841be92611e4b5fdb44/11070111968.pdf In PDF document text
    • https://superchills.com/userfiles/file/datezuvojipelaxovizatog.pdfIn PDF document text
    • http://ruresept.ru/files/file/fufuzedurilijuzisulexa.pdfIn PDF document text
    • https://masterjobintl.com/ckfinder/userfiles/files/jaranariwavowubavuxupaba.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bfeaa082997---wurezesejasazebegawo.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/tafeguwudijidopojuse.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/favaxagofagosumi.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/vubapulezoweguzo.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210603030141.pdfIn PDF document text
    • http://allmedicus.com/userfiles/file/78681572913.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/rmpd6h7u051ig8o7865an2jbua/40057353461.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6ljchq49v0lff910v59sqctk5p/50606307283.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/sokisasizoduwipiped.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/97927646103.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/tojuxetivugidesulikafipim.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/58224336928.pdfIn PDF document text
    • http://capitaloffice.pl/fotki/file/38354249586.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/e2a3c7705688cf72c37dfea33075a170/zoxumeze.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/lajufoxotepugolo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a96bb976d33d7bf2864546916b2141f1/93139285109.pdfIn PDF document text
    • https://sabunwangi.com/contents/files/28493811564.pdfIn PDF document text
    • https://mednet.mk/public_html/upload/userfiles/file/60191189908.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/64136489828.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=carencia+de+vitamina+k+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_off0000b378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8F 10636 bytes
SHA-256: 5a165a1533b8be941af4d550c4d63384e180c1f270a61e6e00322e646d976445
font_02_sfnt_off0000e3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E6 15072 bytes
SHA-256: a10f76028de12c3a293293bb007d638bbf0312d45840a3b809b401128e7963e9