Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e91958056ae2736…

MALICIOUS

PDF

113.5 KB Created: 2021-07-25 05:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: c0beac94a45330fc85c8e73bee228618 SHA-1: 079f5d4ae9f7f1cc11be6897061da33d5c737d6f SHA-256: 8e91958056ae273603a3c5417922c65f156cb383602bda82d28fb3b8fb5e8d2f
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple suspicious URLs points to an attack pattern involving redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://eaas-journal.org/survey/userfiles/files/zekedikevafalokawiraf.pdf In PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/bcdd2a096b57dc78167a27cde582a1bd/korosefaposenazuza.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/kotujefabudobuwizopu.pdfIn PDF document text
    • http://fedoro.ru/upload/file/bojixasevofoduxit.pdfIn PDF document text
    • http://fitviewer.de/files/file/72208501652.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/vfavhdlo88cp9f0jse1nebkpp3/toxife.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607e58f182484---vekotovidugozoxu.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/zenurewuvunoronan.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb0ce7a21---50919882059.pdfIn PDF document text
    • http://akinmedical.com/uploads/file/21818625637.pdfIn PDF document text
    • https://kawanmto.info/contents//files/zegexoxelimorakelevize.pdfIn PDF document text
    • https://taxiparga.com/wp-content/plugins/super-forms/uploads/php/files/3caca50c4e1bf0a9232935a91abc910a/69196446461.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/93132746611.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/ib54toffsfmah06kbo7fmdqb3p/veberamijeruwawizololezat.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fcfb7a828---46964967283.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/7en6gadi3vpg1m62bhvkjhen25/36460272953.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7dc5b74d6---37246415318.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/200664062fb33f9b9bbaaa2873f5196a/salebetagab.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/be955411e721fbd924d82272a17f7a49/dojafijojuxexirakeraw.pdfIn PDF document text
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/8360da6414543b9ea121713132dc3387/21093094574.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/03536281d69901a2dadbd08df6448f77/vuxikujitufidedixilenebib.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607269069d548---lubigaradilob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=twilight+full+movie+in+hindi+part+1+download+1080pPDF 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_off00015902.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15902 17008 bytes
SHA-256: 4980ddf1903e2a11eac7950aac20c7fe21224b21dec05c6fe49d44cdbbaf88a6
font_01_sfnt_off00018592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18592 11372 bytes
SHA-256: 9d737179d241a340493924b354880d27997e37e2f2ef73200ec85122cc90ecd3
font_02_sfnt_off0001a00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A00A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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