Malicious PDF — malware analysis report

Static analysis result for SHA-256 dacda5e768c2f783…

MALICIOUS

PDF

80.9 KB Created: 2021-08-19 21:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b4f15db4163c799915dc97f6a5f01010 SHA-1: 726b73c9765ffff78307086c7cdd60587e3510f5 SHA-256: dacda5e768c2f78338920f0d6f39756f65838fbb2c12e37fa47d2d5ebb6bd000
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what the heuristics reveal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://whkmradio.com/userfiles/file/6712410901.pdf In PDF document text
    • https://pacie.vn/web/uploads/files/kuwovileman.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/62873188072.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/7594967652.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/60538457324.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/44625519404.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/xadowasetawibogotis.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/26554280433.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611a37b830624---robawusu.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b92ab82a---xabik.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/gimaputul.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/1c0341e9fcda16328c793073a720dc99/53360684022.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d908af23731---tumoz.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/96501442237.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/90651262438.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/87547626346.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/polap.pdfIn PDF document text
    • https://5uempat.com/contents//files/49332326901.pdfIn PDF document text
    • http://beateromer.com/bilder/file/budaxonewuzoru.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/jeqvq5kp26k2jci4l753nceja8/wugitekidefujakufadil.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92a818b38---rosameretafejubimezusi.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bf900cc62d9---nulugelabev.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/10970828766.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/xijufafidoxurovufekolata.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+send+la+fitness+cancellation+formPDF 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_off0000d82a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 16576 bytes
SHA-256: 30d8f55924eff9dec4fb9bd51ffd6990201f9dcf824620038407726fb4c9c761
font_01_sfnt_off00010369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10369 10712 bytes
SHA-256: 2bf806d24fcefd72076d58b3480477ff94e3efc57d72a06efb2efa775a1eef2a
font_02_sfnt_off00011c02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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