Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0255f4ce30b474f…

MALICIOUS

PDF

73.2 KB Created: 2021-08-22 12:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c5e2a746685b9e9b5356aad5d6e57602 SHA-1: 7ad94663b031e4873eda4c85ffdc91c92929bf7a SHA-256: f0255f4ce30b474f9392965cdd2823b2854c79812491fa70a771091665305576
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and disposable domains, which likely serve as a distribution point for further malicious content. The presence of these links suggests an attempt to direct users to download additional malicious files, characteristic of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xn----8sbnbd9chja.xn--p1ai/userfiles/file/mowowapasozovedejupu.pdf In PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bc5c744014---gonobatozuxovo.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cda1d1927---wusaxaniludokebatapipibud.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/4005147842.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1fe5defd64---butitojo.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e62dca1afa---guzufakixelisazedo.pdfIn PDF document text
    • http://myucmas.com/userfiles/file/viwevex.pdfIn PDF document text
    • http://polletnv.be/uploads/files/negamata.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/44240394730.pdfIn PDF document text
    • http://xboxheerlen.nl/userfiles/file/26865477763.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/mixusajux.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/dovupababoxamuxixaxu.pdfIn PDF document text
    • https://digireg.pl/upload/remipobifalixuviwides.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/bezelodoser.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/81172220850.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/5d7f7eaa3e3bb2af97f2955d93851a6e/satibokavelofa.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/80745936065.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/58861437822.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a762c722279---fumitegid.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1170e3f3e7---sejuza.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/gasamujemelojijasofopa.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/62321253496.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ba39440a9---nuvasisezusumib.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=adrianna+papell+plus+formal+dressesPDF 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_off0000bd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD66 15892 bytes
SHA-256: 9426bdeae6e4053b32b45e05a2b21fd87edd8c5dfcf326e8be7650ca76ae46d3
font_01_sfnt_off0000e61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE34 10644 bytes
SHA-256: 1d4519d9fbaec5c8a01e6106d4daf1d6eeac398403fc2746f5987fadc31ad69e

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