Malicious PDF — malware analysis report

Static analysis result for SHA-256 799270b2a08ccf79…

MALICIOUS

PDF

85.5 KB Created: 2021-08-30 01:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 031abefcb21e5e6a27762e6660e0aa0d SHA-1: 4a61d563713fafff67d444410711d038e85d95f6 SHA-256: 799270b2a08ccf79de9b4e58600bafb005f346e8fe6be231383a3ce81f61898c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of external URIs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/2u5alqcqrahgfe8gvc27all965/sipabaluw.pdf In PDF document text
    • https://vnmmalta.com/userfiles/file/debuxobibebose.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126369cd70f5---71844088148.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/suvijur.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16079e147448eb---84705645443.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609892eb04617---34776781310.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/tigorupenimag.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/6531527614.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160977f4a54f25---weritur.pdfIn PDF document text
    • http://iwishop.hu/file/99193917652.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609883fc106fa---nijufigewetavigarivumumi.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/92890123477.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/e342302ed470e79c3de7915e5630c901/maxelemolekuv.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612395836cf3a---62547252831.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/voxokoligixupubu.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/637e55f7c28954ecf2480ab863e611fd/16005235273.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/60464035620.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097f6369c406---64606853546.pdfIn PDF document text
    • http://pronobile.de/catalog/file/62632743375.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/xozajedunifaxowe.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15c15db1ed---jikokir.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748b83b0155---61205364950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=a+sketch+of+the+pastPDF 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_off0000ea7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7E 18288 bytes
SHA-256: 5a21632fc5c0f055d6dead67da4b4fb992ef03de53e3c0491c98b1d9f9b39bd5
font_01_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A6 10308 bytes
SHA-256: 98cb8f716dbb48a69dd1d1c00200d8b74a3e58a5160ad705aeff945cceff0c2f

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