Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca561c3bf87f9b2…

MALICIOUS

PDF

90.9 KB Created: 2021-07-03 03:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e312105a1b77d4a70c469d2f8a4d249b SHA-1: 77bd79b3e65ff2cd0ea41a351b043deb12587b72 SHA-256: 2ca561c3bf87f9b2e4870470f6e233af0bab1fa4c046994efb458c967d8f66bd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zimaletto.com/uploads/file/sasokezufutixupagelaxufu.pdf In PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/559178c8ca14a153b07bf8448d87f12f/jafupuvubokiz.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c162812dbeb---golakuxowosotazo.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/75670218328.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92c9200151---noxexenidaliduwo.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607954e89bd30---jepifoxozofukin.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/11724951349.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/53860803786.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f88cb06a4---soxekiv.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16086ef07e3e2d---11755525742.pdfIn PDF document text
    • http://fundraisingwebsites.com/clients/9/96/963d931f30a9d2280975e71a7f923c96/File/safenamokemebeniwirax.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d42682c83---81701708574.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160842fd68e9ff---19639486745.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/461e0f786b5047a19d1c58486bcbedae/gepija.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/15025314687.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a30331b1ce6---75371446359.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/07a50f739f9d86003439034686788482/87686894430.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/e5bc2d06213b883f96db58d64a9bbf8d/98197549060.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb6c67705cb---74327441276.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160afa092d0eb5---vewefaminavaledowoxaw.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bad56b7b3---bobobufivobakakulasakat.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/23796089063.pdfIn PDF document text
    • http://poorclarescork.ie/images/61261352898.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/tijav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=fast+and+grand+multiplayer+car+driving+simulator+mod+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000d9e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xD9E0 20748 bytes
SHA-256: da687793a54f51336cb2e22919b12693e2ac5d1d15c2799fe2407a6364cf28c8
font_01_sfnt_off0000fb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3A 11204 bytes
SHA-256: 44d0b33e1021c87f683aa9aa7245ec7897a44aa61bce85530831e0a47aa1bf01
font_02_sfnt_off00011542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00012d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D54 19208 bytes
SHA-256: 62631956f5d6b52297b6b3ff8652941772462d0b8e2e6d1cc5fbe04962d49aeb

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