Malicious PDF — malware analysis report

Static analysis result for SHA-256 59ea56625ef5f3ae…

MALICIOUS

PDF

83.8 KB Created: 2021-07-01 10:27:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 34f8e3c863865c3aed9871ef42f09c29 SHA-1: d0f10b31941ab6fa87a143f5c1524041867aa9c8 SHA-256: 59ea56625ef5f3ae300238c8b53aad44c6fb7d737d6565c58a979a5356a5a563
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The file functions as a link farm, containing numerous URLs pointing to external resources, with several hosted on compromised WordPress sites. The presence of these links suggests an attempt to direct users to malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://khabul.mn/mmpa/userfiles/files/60699110047.pdf In PDF document text
    • http://rlangkhan.com/upload/userfiles/files/tatafalukavojumevafukepiw.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/pujegebupopemigi.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/24122083178.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/d3d2e195b007c90b3cd15f978ec32496/losapix.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/41af070ce6bef88272c9c942a0f4d2c6/55290312119.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0799afb62---zarokunuwatelitufeli.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/jomijaluxawol.pdfIn PDF document text
    • https://simplehome.ro/ckfinder/userfiles/files/25136786954.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/41230590162.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16073a7200daf4---varaj.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/78835099466.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/demisokubekiwefugi.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/zuninu.pdfIn PDF document text
    • https://maturana.cl/upload/file/nufebipumelogonelirep.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/20296387171.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b320c2455d3---89592116588.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779472e68c3---36760423321.pdfIn PDF document text
    • https://bawwabatrizq.com/userfiles/file/kubejagigeku.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/176d18b703444fdd1a9a9bb606956a4d/85244362073.pdfIn PDF document text
    • http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/dedogolisepabunokuvu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608729ea2e368---83351710589.pdfIn PDF document text
    • http://tele-fonika.pl/upload/file/nozijokemikewiluwabugeni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gimp+colorize+black+and+whitePDF 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_off0000e3b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B1 11028 bytes
SHA-256: 142a7eb2603b1c1cc30b8c3ed4f227ecc53899617f440b81c5818836d7c3d924
font_01_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 17288 bytes
SHA-256: 08dd25162640db9801c5cf91d19c42e2cb1857c11d1ed8630308919ebd22ab53
font_02_sfnt_off00012a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1