Malicious PDF — malware analysis report

Static analysis result for SHA-256 9daa4eb1b514cb35…

MALICIOUS

PDF

97.6 KB Created: 2021-07-27 22:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 32d92be8517ff786cd0019bf85828f38 SHA-1: 17485e4a604d58ec75be6cebc4daccd03dba1fbc SHA-256: 9daa4eb1b514cb35bcc6fec9466942a77622d2e84b45bcaccc83e1acbe7ce8ff
156 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised CMS upload directories, likely serving as a distribution point for further malicious content. The document's structure and the nature of the embedded URLs strongly suggest an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://duocthientam.com/uploads/ckfinder/files/61409350386.pdf In PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/juxawovudugizedumejom.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0a6984dff---jesefiropiluzoteful.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c0c41ee657---41998332254.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/b913a23f87eb9d59c9a680a30e2676e8/57300364599.pdfIn PDF document text
    • https://pindimana.in/uploads/file/boxujozotubaxowegisexe.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/me6j77fao50e58oa7hmki2ek06/3688715599.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/75439377042.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/dubixuturipuwax.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/24318707133.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/vumugimafuvamibenege.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/6l21oqh5mucbsd630ggmcag62e/sojawopuzofilosufovelapa.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/4e7bdcbc5eded2ce869bdfa93a9afb08/56619631318.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/xobazoxiwekinexobififanuv.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ar8fdaa5vjrhu78l4jpo6nhms0/42587872031.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/2008e1457021957184d5f53018b3b904/marudaredemeroxu.pdfIn PDF document text
    • https://baoyi-chuck.com/ckfinder/userfiles/files/jutenuvosumowame.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c12fd49528b2a083e199f217728ea584/26021759186.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a03ceafd---18447799353.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/0c8bbc85aeec44a5de9755f3a4ead414/25537391431.pdfIn PDF document text
    • http://aimic.com/userfiles/file/sadur.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/18018552597.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a309fab963f3068b8cd5d6a3ce433ab9/zokujenamat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=child+labor+in+textile+factories+during+the+industrial+revolutionPDF 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_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001305c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305C 17128 bytes
SHA-256: ac403cf20e1badeb7137ffc6faaccbab7793b1dcde139cd3d815202949fc2b4c
font_02_sfnt_off00015d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D33 11192 bytes
SHA-256: eb0d83310bc55cc6345c9d16b2da0414c8c06ce599c50741acaed277af30a00e

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