Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5a16051a91640c2…

MALICIOUS

PDF

73.2 KB Created: 2021-09-23 19:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 61d7990d7ece4969454b82f947b657d4 SHA-1: 1c4bada5ab79352096754fe7a20307bb555a11bf SHA-256: e5a16051a91640c27c98f246ba5bce19794b57902281d8d05189c833906b42f7
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories and disposable hosting. These links likely lead to further malicious content or phishing pages, indicating a phishing or SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://alakharia.com/public_html/userfiles/file/mipakiredeki.pdf In PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1614bb84bc78a4---14343923440.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/fdc86da1b859e7a74cc0346708f3a719/93862522647.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1b079071---vivirop.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210917203145.pdfIn PDF document text
    • http://gazetavk.ru/img/file/rabejipigatifep.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109050605013479.pdfIn PDF document text
    • https://simbhaolipower.com/images/file/20164866111.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/povavu.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/80710394150.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/48048097781.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/kotijegobeniminik.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/fexot.pdfIn PDF document text
    • http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/mikanim.pdfIn PDF document text
    • https://tepihtrava.rs/files/47171653715.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161425d45e74ad---sivopokufonap.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/53494895984.pdfIn PDF document text
    • http://probeg2000.ru/files/userfiles/files/virumejofewipika.pdfIn PDF document text
    • https://ccar.host168.com/data/fckeditor/files/78486739133.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/kusowafufuniv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=league+justice+snyder+cutPDF 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_off0000b9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 10680 bytes
SHA-256: d87bec0158e2f518e606c46ae571b64f843190b741bae003464bd481dab1ca9a
font_02_sfnt_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 17420 bytes
SHA-256: c060a9f8022b80d3e3a3e40968c4e8e749f9befe840d0b9939d8a956a07d35a9