Malicious PDF — malware analysis report

Static analysis result for SHA-256 336ff0803d33f107…

MALICIOUS

PDF

76.9 KB Created: 2021-09-19 10:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 223841f8e2d62899e59d9f22affbac06 SHA-1: 47f0645d9bbb5fd31b548a071e4878b6d6ccdba9 SHA-256: 336ff0803d33f1070177f730c15423f71300bbf4062bcd75280e9708ef16ee71
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. This suggests an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://nhadatv.com/webroot/img/files/jaxepirogano.pdf In PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613732fa0293d---96264452201.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/kupubatoxupesojijowegefa.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/vemuzo.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/jufija.pdfIn PDF document text
    • https://apra.pl/files/file/kapibari.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/59007330873.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/dodafini.pdfIn PDF document text
    • http://wimborst-ceramics.nl/public/view/upload/fckeditor_images/file/duleropoxej.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/bunepimuvalawawofika.pdfIn PDF document text
    • http://winso.tw/userfiles/file/21307985591.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/kakofewaza.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///87921941698.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/n5b3596htjn329jhim78h0mv86/43095918294.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/zapuzajanosafomunavetuz.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/kaluraxegi.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/pumosanesawomixili.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/kibudugun.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/78733126102.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/9321877ac3ee1568386c08b0154f913f/28223625649.pdfIn PDF document text
    • https://areicon.com/images/file/8695853112.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/rodalopipikozetim.pdfIn PDF document text
    • https://wedding-photos.cz/userfiles/file/jalozosan.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/wazufu.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/50767091564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=pokemon+all+peoples+apkPDF 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_off0000ca06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 10216 bytes
SHA-256: 32a4f1adeec3c7df64d9e38bbac87d62c1e560446afabfb3e73190437ae632ec
font_02_sfnt_off0000f906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF906 17112 bytes
SHA-256: 5502f1d74f4ad13a4960fcca694015ee8354559a0de0706813a8822aaf814785

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