Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aebf8bc3df1c5fc…

MALICIOUS

PDF

92.9 KB Created: 2021-07-17 14:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: dae58f0397303b010a296c2cb178a562 SHA-1: f7c91f2b710fef704a81b98608b08bf4f104be91 SHA-256: 5aebf8bc3df1c5fc5068f5b1bdb981c73966e14a5f1a54b770e31b1dd492f2eb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting domains. These URLs are likely used to redirect users to malicious websites or to manipulate search engine rankings. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee6a02d9d5---84166700716.pdf In PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda68ea1e3.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-7/20210507202608113697.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/57457589709.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/8fd73e382c857a85969878171b6fff1a/tufamowukiruxoxi.pdfIn PDF document text
    • https://makenie.com/upload/files/zubamiju.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/ee9dbfceb761b1442fc706cba053d12d/2241911452.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/cbfb4ce05b34a0a3ab65341658c7dae7/55936262516.pdfIn PDF document text
    • http://bwc.lt/i/64054876194.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/ef9beb4ce64087ecf3b4769bc86e9bb8/fasatamatiposewenurisavup.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608faa397e972---pokajuvesubomerulub.pdfIn PDF document text
    • http://birzebbugastpetersfc.com/files/file/kupud.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/0440bcd2d9c345d941ca3a4c5fa1e335/safed.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/jitolufugatukilogit.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072822a50fe5---90356875208.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/42925590146.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f3ebe37fd---fusulifun.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/domafezixelega.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/cbqhpmmjooact3unqinsv4rur2/fitonixuwetojavasopimup.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/c8999fea54a00a24a5fcb7275e010a89/50682272112.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/40048002505.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/16548df81d48c51edf05de56ce52eb3c/75630784481.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160820ca40e694---6667049823.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210716_DD9DDCF7D8F7D95A.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=a+number+divided+by+4PDF 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_off0001068d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1068D 18244 bytes
SHA-256: 1a2e352a575c384b958f102458b3b9020f972aee38df83399332d7a3a7a72c87
font_01_sfnt_off00013710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13710 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F27 10296 bytes
SHA-256: 769f587a027b30e0ff94cdefaaac2a604a1890f9520e5b19907e8b1069ef282b

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