Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ed703b850d522f1…

MALICIOUS

PDF

84.5 KB Created: 2021-08-22 02:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 49ff85b7214f081413f23533b0ed2b56 SHA-1: 25681b0689a8f6decec45842a1c20e8d4dcf2b2b SHA-256: 5ed703b850d522f11e1f457b9b495a572be8e1ec9170e6ba4289a691c95585e3
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to external websites, many of which are hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially harmful content, such as phishing sites or malware downloaders.

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://irlanc.ru/uplcv?utm_term=libro+desarrollo+organizacional+wendell+french+pdf PDF link annotation
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16114029186d56---17794849858.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/nisitedefovobobujurok.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/81178628164.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/lumabibedub.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/12462147207.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ce35cb041---warotelubutu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081654c4e639.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/19a3ndnhld2n19ln4n5318p3l1/9092844653.pdfIn PDF document text
    • http://taikenplan.jp/ckfinder/userfiles/files/sivazonidul.pdfIn PDF document text
    • http://natproperty.com/userfiles/files/33736254994.pdfIn PDF document text
    • https://nhanloc.net/userfiles/file/rewuwapanotowiwotanulogad.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/41949595920.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/shtu8uh4oktjc5pnqhkf1f8781/89104925166.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081da49e7077---bogeniwiwakubimijinutukef.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/zojenimoturawakabulef.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/vajupezax.pdfIn PDF document text
    • https://wittnebel.dk/file/fejotidiwotesugesusiz.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609efde6d4eb4---70737542927.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607452eae2014---51753461505.pdfIn PDF document text
    • https://questyme.com/userfiles/file/purezobow.pdfIn PDF document text
    • http://18554080.com/userfiles/file/84155375098.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161122fff48867---suvikanibaxepug.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_off0000e2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AB 17968 bytes
SHA-256: 29936872f447a177b6a935fd422c6eba3374a936c7649a2fd52d7372f7357a0b
font_01_sfnt_off00011062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11062 11044 bytes
SHA-256: f925f00be74198922d0be702ddeb2e855e6e155b3a0b12fba17e304f024a4d7c
font_02_sfnt_off000129a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1