Malicious PDF — malware analysis report

Static analysis result for SHA-256 1063c72245776346…

MALICIOUS

PDF

98.7 KB Created: 2021-08-05 15:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 137a023be60592159af782f37e3ba8de SHA-1: 29b5640f655068977268b4bcba8b44d8bf413729 SHA-256: 1063c72245776346ef8a61c108a7c983755b42b5184c85b366bbc24ede357fe7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple URLs pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076358a72e69---xemaxi.pdf In PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081171996764---gulikokaxun.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/61158661718.pdfIn PDF document text
    • http://aplus.to/userfiles/file/gipiw.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/33kjlgi4tm25s7fg4j6s53mc6k/fixedonedizexafijoteko.pdfIn PDF document text
    • https://syntellect.ru/Repository/file/gorobir.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///zudugar.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/mudiloxuxetozonukebugewo.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/wosixajap.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/83204233595.pdfIn PDF document text
    • http://rld-carbon.ru/file/badexumibozufuvudunu.pdfIn PDF document text
    • https://cecprint.com/images/file/51272549803.pdfIn PDF document text
    • http://dhf-china.com/d/files/tekojebiwa.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1628132608.pdfIn PDF document text
    • https://mfdesign.hu/files/file/55403942917.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/newoluxapalawikaduw.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/nulopominukik.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/51824504766.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608038a1a4288---muzafogaroturanovijanakur.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/54290159455.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210506195451_829366785.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/muweka.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/54384937779.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=contoh+soal+siklus+akuntansi+perusahaan+dagang+metode+perpetual+pdfPDF 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_off00011ea2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA2 16888 bytes
SHA-256: d085d68ed1513be5f21f8e6549d09bb012d8e0521dca1fd01bbae1f1c5853873
font_01_sfnt_off00014a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A87 11168 bytes
SHA-256: f70b2dd02383d2230ad23a06d8f6ba18199021175d34209b5f9b9e6574323596
font_02_sfnt_off00016442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1