Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77f8db7b77c1245…

MALICIOUS

PDF

102.9 KB Created: 2021-08-10 01:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 52803efb4ffac39626d85ce3ff09e161 SHA-1: f6a40c80f0803aefac6bc30c44e4a8eea53bdcbc SHA-256: e77f8db7b77c1245f7b570b2d88e502ab9aadeed928c45b705354770ca9c0613
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads and disposable hosting, forming a link farm. These links likely lead to phishing sites or further malware downloads, indicating a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://progetec.org/userfiles/files/90749725267.pdf In PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/0f2beb297e60ccd7683d86819468d559/52203214363.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16085cb1e1f663---vasugoxu.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/83e5c61bdc23ffb7ea14b2ba364015d9/gidodipevivajoxixoxeweb.pdfIn PDF document text
    • https://tranhtreo.com/images/ckeditor/files/77590308480.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/verivivil.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/78288358871.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/87886501685.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/84021863800.pdfIn PDF document text
    • http://954move.com/clients/4890/File/20750450963.pdfIn PDF document text
    • http://xlsferrosilicon.com/d/files/gomusuwopob.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210630044727164660ojdfglhg9gca.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/xalikugegegoxorusepimana.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c79b6ae8fe---pazat.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16088f8ee36f31---jizegevoguletilalasu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161029ac3db2c1---fabivegifatafalez.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/runusiwe.pdfIn PDF document text
    • http://jarosi.hu/files/file/64581867274.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/88159701328.pdfIn PDF document text
    • https://motacademy.it/file/jeberijak.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbb52b8d80---83603598207.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/sebuwogubukufeje.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/lipeziwezod.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/2nv1dk49bnsi32u5grlfnla204/58971111758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=corazon+salvaje+capitulo+53+completo+youtubePDF 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_off0001244b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244B 20308 bytes
SHA-256: cfa1acf791e78ab553ff7f4b12d4fbc710049648ca67966fbc87e8337abb7dc7
font_01_sfnt_off0001577d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577D 11480 bytes
SHA-256: 0a1e673406507841bc57b6d0241217d4e5e4814c941a9d0762544045f7c1de6c
font_02_sfnt_off00017286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17286 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1