Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f047ffd93418874…

MALICIOUS

PDF

114.3 KB Created: 2021-09-03 08:27:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6d40f69c3774268ea63e516d18c15fc9 SHA-1: db154c480dba74ee18b37f35139dc35166bf066c SHA-256: 4f047ffd934188745aae1cec130a335aabae8b5871b42fd915579502b3f33251
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://melinterior.ru/userfiles/files/vejudumupokedazoberesapu.pdf In PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a268d06720f---wejupazufejijutesalimax.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/zofotofimopolelawasebiv.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/liwoxefetonijazopugexe.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dkbcole89h74s8indh7j7uc2f5/89606140974.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/05445b6086018cd5c6dad6a096c1a504/ninozamajipof.pdfIn PDF document text
    • https://ski-experience-japan.com/images/blog//file/junifevopomenaraxomirofi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/3e2323972fda8be78949292d5cb710b2/80089704433.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/85474144705.pdfIn PDF document text
    • http://salukool.ee/upload/userfiles/file/49883637517.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b48c2d01e13---woxomam.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/zizaxupatarumexiri.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/97207391290.pdfIn PDF document text
    • http://www.predia.cz/userfiles/file/sezozigotiwalujo.pdfIn PDF document text
    • https://33mobility.net/uploads/files/fanojuf.pdfIn PDF document text
    • http://dorrstrechy.cz/UserFiles/File/sizudometetinanexenekifof.pdfIn PDF document text
    • https://dtd.com.pk/ckfinder/userfiles/files/rasaviwutimupu.pdfIn PDF document text
    • http://innotack.com/userfiles/files/63860790863.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/73153689895.pdfIn PDF document text
    • http://apothepharma.com/upload/files/nejivifaponawejure.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/lijojoxa.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/e91087867b9d8fa35d9c0bab4cf6b677/ramikabemisamolesul.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdd4be10a2---wojabelamijaxezukiguran.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/xegowovabazajem.pdfIn PDF document text
    • https://digireg.dk/upload/pazikitenegegevomozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=commercial+lease+agreement+vic+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_off000158d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D5 11060 bytes
SHA-256: bbf930ac79470cb320ad9b7cd52f98a63566e0aea8fbdd9d1fd18e0847fb5ad5
font_01_sfnt_off00017269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17269 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018a7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A7B 18712 bytes
SHA-256: 9358a6cacd61297511d6e73e4bc2ff6c876847bf21ab0e503627377008deb15d

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