Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6e1ff3f4b741fc7…

MALICIOUS

PDF

83.5 KB Created: 2021-06-26 05:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae0e2cf5188ac4fe7c5e7570c1a137a3 SHA-1: 98d665ca3a2325affedc5ed93f7ed38bed9b20f9 SHA-256: a6e1ff3f4b741fc71c07ba98061303ba88815e90cd13e79777c1e240cfb62ba0
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure align with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=279+ipc+in+tamil
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0c19032ca---lijulupit.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/a0bf6e6f31e250fcf188e797cbb2c69f/28161887503.pdf
    • http://norilskgu.ru/userfiles/file/55172852905.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0db141ac2f---zepiliwixigiwuregurexa.pdf
    • http://clingac.es/d/files/31899743445.pdf
    • http://takeacode.net/user/d41d8cd98f00b204e9800998ecf8427e/file/95092555796.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6294a58753---6822862320.pdf
    • https://anthonygillant.com/userfiles/file/gerogageme.pdf
    • http://notariocprietoa.com/notaria/documentos/files/46112052474.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/7a647ddd80b2c96f1fd196eb35db28c2/namiwasodevoz.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/f10d69e30cfef9ebf8c19706d5bec69f/96109671685.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/obonjivlblipvt60unnav54k0f/zupivewesek.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/bigajusazitadu.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086db3fbb942---15186036437.pdf
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/eee3496b2e936010a39fdfdce764d521/ginogisumajev.pdf
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/fdfb507cc1d99e137ad4f5ea18b618d7/87380574256.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d2b395900---48155366093.pdf
    • http://watthaistuttgart.de/userfiles/file/xifogepirap.pdf
    • http://kamnitikamini.si/upload/files/88824512011.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d3f6dca65a7---40589159401.pdf
    • http://clubchic.lv/c/i/files/xepiro.pdf
    • http://muskogeeroughers1967.com/clients/9/98/9899c641331876fb313f08ec475a0443/File/91848240858.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6cd.bin
9df0442b3e8d1802a1d87b42dfee80b8275b376f8519b7de6074a07a45e16816
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CD 16544 bytes
font_01_sfnt_off000111e8.bin
3585ec175f34b76d0ced99686614b760d387826d8432969cab01f75bcd490efc
pdf-font-stream PDF embedded font (sfnt) at offset 0x111E8 10256 bytes
font_02_sfnt_off00012908.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12908 16792 bytes