Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc9c0d1c4c0dbc24…

MALICIOUS

PDF

91.0 KB Created: 2021-07-31 13:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 61b5df38c3f04d3802200cc07c900d40 SHA-1: dba2ae69a5562f433193011eb31703eed1f9a9af SHA-256: bc9c0d1c4c0dbc246e627a79654ca39e124061587bc555849ed80119cb1ffb21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The primary attack pattern involves tricking users into clicking these links, likely leading to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/xolosowiribagu.pdf In PDF document text
    • http://jandebruijn.com/uploadimages/files/sanutirunet.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/782bd5fc22a17d9817d0870aecd64771/27738147308.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/tawog.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2b6b43b0c---31054354634.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e92a9b9df6d---pakurakekafekot.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609517b8e50b7---38873930961.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/duvafisenugute.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/93252123178.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2536574d2---jozesugajuwapelawosawara.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/lepesevetoxo.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091574b61681---pisizidotagovavurasojex.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fac6a2aba---67729981908.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/fidonuru.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160989c5167be7---12126920326.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823b46d772c---18652289641.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e9ff3e4dd---13628859817.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210701_E24AE0E399D53EA4.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/pujibejugigajetu.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/81194650112.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/vjm82huv4t8uu5o9j2eh77t230/nilesalujiwaruliw.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2f88842f3---doporanomat.pdfIn PDF document text
    • https://theurbanthinktank.com/files/nolukanuvefonejazizobubi.pdfIn PDF document text
    • https://autotrans911.com/thread/admin/uploads/file/gomugukorarizodikijedijuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=no+sonr%C3%ADas+que+me+enamoro+sagaPDF 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_off0000fa15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA15 19440 bytes
SHA-256: 619663c325c59dc1a51b7e3c0e11c034b52df895c9d273e764648ab3a710a1a2
font_01_sfnt_off00012c86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C86 10500 bytes
SHA-256: 80d64052011dd4bc9f6fecd27ac54e5c6dfc00a20814d1524ac2391a49c62752
font_02_sfnt_off00014419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1