Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a6cac42360dda2…

MALICIOUS

PDF

74.6 KB Created: 2021-09-15 14:06:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1f2f28daf233d3d7cd07a0f5de34b303 SHA-1: 56e74b11ff317b5eb76114170c7f413d777aba1a SHA-256: 27a6cac42360dda29082fa2f808f147efb17f1e06b59564f7ce335e1946bba92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The presence of a link farm pointing to compromised WordPress uploads and other disposable hosting suggests an attempt to distribute further malicious content or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ketchas.ru/uplcv?utm_term=torque+pro+themes+apk PDF link annotation
    • http://drukarnia-skawina.pl/app/webroot/media/files/godejukurezobuluzen.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/xuxafejomi.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/tamujazuvegekefo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135c6ee3e222---98985677529.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/jivaragi.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141623d63e2c---vebezemutu.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/94654190861.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/68689721631.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613dd40fa506b---zegojepivotenugofili.pdfIn PDF document text
    • http://abwessex.com/uploads/files/fazavazu.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d0b32bbce---74831328024.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/74586383466.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/retapi.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/gomenubidijuxavowuto.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/40830958604.pdfIn PDF document text
    • http://praguetransfer.com/files/file/59789822251.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/zagobifupabuf.pdfIn PDF document text
    • https://terracetemayonetim.com/upload/ckfinder/files/zagamo.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/88644396774.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/tovebanedebabodavofugas.pdfIn PDF document text
    • http://anpharma.net/upload/files/masetej.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f81206692---50242272436.pdfIn PDF document text
    • http://ranch.pl/files/file/jinujoruwov.pdfIn PDF document text
    • http://zssadkowice.pl/pliki/pezirive.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/popozepulizi.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/seram.pdfIn PDF document text
    • 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_off0000bed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EB 17884 bytes
SHA-256: d75bd2d960bc5d59a29c2475f2f7f0edc5fe7920e374b92ec9110e90973c6605
font_02_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 10576 bytes
SHA-256: 74cc31328883b748158b09a62329a35a7851d1579992724885db9e3e35a109d1

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