Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6bcb4579616062…

MALICIOUS

PDF

74.8 KB Created: 2021-09-12 15:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f80d3271efec105e8987f836761fa185 SHA-1: b3c75a8f48b1c329fba66370310a9b3ba5085c76 SHA-256: 3d6bcb45796160624a05694d7adfffccc512402b6e20f2931f7fd3245e094c8c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://inimtrento.it/userfiles/files/52232032615.pdf In PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/53639815041.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vumosozalonufosugodopip.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/38985044394.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/6b9dcff019cc56c8089aea0bc03e9134/39129666330.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/devasode.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090412163173499.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/diduwifusiregus.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/63287084072.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/21055495772.pdfIn PDF document text
    • https://lompatjauh.com/contents/files/luwufitewosorolem.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/jomikisu.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139c04eb3afc---zefejejarufarite.pdfIn PDF document text
    • http://gruppocaminiti.it/userfiles/files/gomivomi.pdfIn PDF document text
    • https://kermanrooz.com/img/files/zedubujun.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/fevekopegofoludafu.pdfIn PDF document text
    • http://mjacz.cz/soubory/files/zosinugadoxaku.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/2aa82aa95e48ea76ed5f0b6fab32d439/pozojulam.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/99a3659903d8ab2ba57f5bcd0ef67364/bebaxufo.pdfIn PDF document text
    • https://valubil.com/public/uploads/cms_file/cms_files/15701385517.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/dorawopijoraveresowo.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/pumafexum.pdfIn PDF document text
    • http://hexindechem.com/upload/files/42101418820.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210901160304.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/1605328772.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/22497938412.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/titozevuzilo.pdfIn PDF document text
    • https://designclarf.it/file/58652814024.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=jio+tv+app+on+smart+tvPDF 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_off0000c488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC488 16308 bytes
SHA-256: ff10f63a26cad9071e437dbe3b526596b7ec0be1bf1fedc0fe26b227f9f6ea7b
font_01_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 10292 bytes
SHA-256: c969acaf880aba2fd36435bfe05ae42087b0d5cebd4526bb7eb21d24084815ac
font_02_sfnt_off000105a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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