Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6baa0071018a8d5…

MALICIOUS

PDF

81.2 KB Created: 2021-09-01 03:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b69d9dfbafa1bbc293c59671fdb42ba0 SHA-1: a1e185ee3d9a6998d3b763ac25e97b8e4426e3a2 SHA-256: d6baa0071018a8d554fe85f61fe71ac3dd72f74f98bd2f2e17b2c2b3fb24c77b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF sample was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other hosting platforms. These links likely serve as lures for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/65010bfd8e98dcdba75ec75525304389/vorudumureriw.pdf In PDF document text
    • https://afra24.com/basefile/afra24/files/fuzediwopi.pdfIn PDF document text
    • http://careerdynamic.com/clients/3/3d/3d9dba0a3645e5854abf1db7654b9c86/File/40862009635.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8ad91777f---24025304743.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/90426916019.pdfIn PDF document text
    • https://diaspoassur.com/wp-content/plugins/super-forms/uploads/php/files/12f198a9a20d032cb258a2aeda54d713/65985366098.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcb55baa144---21185368253.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a355c6d1dc4---jivewimazuwefupawa.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/1c2c2aqram81rsf2q2ql9qcil6/tuwejujezujokiwigufi.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/22220888038.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/hn59diajodpa3gb2qu8lb7r5d6/regevisiveronogiwisudok.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/307271ab9d6d3229697d6584f945dc5a/kutufosazuzomuxom.pdfIn PDF document text
    • http://giasudaihocsupham.com/Images_upload/files/71866224346.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/tumupigikudowize.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/44400278656.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sumedojosuxupotazalebut.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/58948794048.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160993bc0102eb---19165524587.pdfIn PDF document text
    • http://cga82.com/admin/File/59607254963.pdfIn PDF document text
    • http://schturman.ru/files/files/98027191303.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/65803797024.pdfIn PDF document text
    • https://yz-yongzhong.com/upfiles/editor/files/gesofetasalike.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=jac+2019+10th+resultPDF 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_off0000d289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD289 19612 bytes
SHA-256: 569d41b44772656938c232af3e5b29a879fb432a180431ab5d51a63e2383482c
font_01_sfnt_off0001047a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 10564 bytes
SHA-256: fe54ee995836bfdfed6e3b1df5ddd4decc540ddb98fecfa108fb3f2850ebd510

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