Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f04254b1d5d4c0…

MALICIOUS

PDF

78.4 KB Created: 2021-09-15 19:14:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eebd76488c023e1e89d0b453923f9020 SHA-1: a9d253245b409626c5e8b5a6f26182ac4d56d113 SHA-256: 45f04254b1d5d4c095e8ff2997c3519ae506a258ae73be7cbc520cfdd154d1fa
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting. These links likely serve as lures to phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/575c43920ad21bc12129df4264c7fc46/bazonalofenugakaxu.pdf In PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/dapaseda.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/62546716376.pdfIn PDF document text
    • http://finemetal-cn.com/upload/files/foxejitidoxuxikoneral.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/gojawitodikuxafasu.pdfIn PDF document text
    • http://linuxnewyork.com/draft/media/43728212824.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/19021680760.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/dixuxasibobu.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/bopilekodokufuvan.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/96544197715.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b3c32bbd8---58527387613.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/2fe6e99beb91377d51a4dcdd02a3bace/tejujidudifebokomij.pdfIn PDF document text
    • https://fratellifurloni.it/file/40798404735.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/xubusinonudupimikalifaza.pdfIn PDF document text
    • http://baovekhucongnghiep.com/upload/files/fisutexabibibano.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161328ef38a53d---87328827298.pdfIn PDF document text
    • https://www.tahitotfaluovodak.hu/ckfinder/userfiles/files/xitavuwenigovojo.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/ridipigofekuvakejufaf.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/lenipomakejimonozigi.pdfIn PDF document text
    • http://xn----8sbemnkjd7bfu.xn--p1ai/design/img/upload/file/fapiwilobabaki.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/26661016003.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/92321962046.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/83576397588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=android+change+image+resolutionPDF 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_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 17260 bytes
SHA-256: 76a34b3a6d54a5d879c28a232fc586dad6796577dbc7f493aa539208de04d119
font_01_sfnt_off0000fad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD0 10900 bytes
SHA-256: 21a2fbbf1f2a94392e7905b45479c301f40af09684b30a7845cf5f368832213a
font_02_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1