Malicious PDF — malware analysis report

Static analysis result for SHA-256 57b70821ced2ffe5…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 05:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 80ad7ba9e4d7d2ed07844f51a09fa9c6 SHA-1: 7e9abe4bf529ac517399ceba2e0d30794ab9e68f SHA-256: 57b70821ced2ffe5f36601e2cdcdffc55ed9d006276bf7348cb51a098de6d736
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs that redirect to other PDF files, many hosted on compromised WordPress sites or disposable domains, indicating a link farm for distributing malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a phishing lure, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://infrive.ru/uplcv?utm_term=bubble+witch+saga+2+game+free+download+for+laptop PDF link annotation
    • http://ominocoibaffi.it/userfiles/files/pemanadejobapul.pdfIn PDF document text
    • http://www.centralperdana.com/file/pafufuxagijafisab.pdfIn PDF document text
    • https://diphong.com/uploads/norivifuzoliredaro.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/somefiko.pdfIn PDF document text
    • http://palmdale.thepokeluau.com/uploads/files/71764036064.pdfIn PDF document text
    • http://thegioioto.store/upload/files/jepujaluvitepajejofu.pdfIn PDF document text
    • https://path.mn/userfiles/files/37127818596.pdfIn PDF document text
    • http://gestaocipa.com/public_html/Imagens/file/nepexarotemepugobot.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/binuvomepafa.pdfIn PDF document text
    • http://mayphatdienngocquang.com/media/ftp/file/juzarijulokimoji.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0143317001631422314.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad471c0eed---56287157346.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/71776212681.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/1037554557.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161315f2943d03---pezumefemivaxire.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/29440684353.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f2f90e078---98998338434.pdfIn PDF document text
    • https://qnzar.com/files/91823801450.pdfIn PDF document text
    • https://equimat-cheval.fr/file/70128528161.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/11541242181.pdfIn PDF document text
    • http://easytravel63.ru/ckfinder/userfiles/files/95633233870.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134b91b9ece4---boxoxepovoniv.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/77219465083.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/vuwujawisabej.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/56377448899.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_off0000d9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FE 11564 bytes
SHA-256: fc3e02cebb8d5607a0e2360c75cfe15e307085384863080d04e06ab79ae2bbfa
font_01_sfnt_off0000f4f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F8 17180 bytes
SHA-256: 5bd875a4d16771e13c349bda29c6979095a43c94ca6b18d6480d5dad705566b8
font_02_sfnt_off0001217b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1217B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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