Malicious PDF — malware analysis report

Static analysis result for SHA-256 e82a85aa4222865f…

MALICIOUS

PDF

86.6 KB Created: 2021-09-10 12:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ac0a3a026b78b979cdbd62074c47ea3f SHA-1: 2b26a4f420d19e2ef6e51afa262e86f984534c69 SHA-256: e82a85aa4222865f9b04b74220c280f8ab52a47612d3e36305bc5e1cfa3d413b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=48+laws+of+power+pdf+format PDF link annotation
    • http://skrutit-probeg.ru/upload_picture/file/pezawibu.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/32884251373.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/88079046274.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/86685773337.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/28349598899.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/10131970226.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161317ef95f8de---fufewi.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/matokaluguko.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/zudavurejagudi.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/34012575023.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/tapegekasujajodekenibu.pdfIn PDF document text
    • http://mydreamtuscanwedding.com/editor_up/58929863202.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161335fce09093---pugirenujaraxo.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/75391562011.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/lugezexoriwukuxulotopolum.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/66436604711.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/50631636718.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-4/20210904030649415120.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210910113428_x03y18.pdfIn PDF document text
    • http://ndc-group.ru/uploads/files/kigaburagi.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/fabiginaxelegexudedatalot.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/xarejasifosovoxoradoraja.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e0b2f1d79---34745130442.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/miwabominiwip.pdfIn PDF document text
    • 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_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 17180 bytes
SHA-256: 90debf76ffef032f1a89c189236c85474e4dba64f019713d7ff18f8ff019f697
font_01_sfnt_off000119c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C6 10740 bytes
SHA-256: e67b373ce2ece77b1cf11cb9081d77621c5bfe7b0c41fb920308288c8493e20d
font_02_sfnt_off000132a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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