Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77d84c3ff88675e…

MALICIOUS

PDF

102.1 KB Created: 2021-07-12 16:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4c39ab8f28f32306f5bf7ee4dcfb4001 SHA-1: 5c0c4dda55f23142ff53a66bf41608eabeec94fd SHA-256: a77d84c3ff88675e547d40b1b90dee94df7db339797b332290da009f89c62ff4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the numerous external links suggest the primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

Heuristics 7

  • 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 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 http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1609465dedfc97---nejix.pdf In PDF document text
    • https://smartcrm.cloud/upload/files/74090084739.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/1j4ebgulra0otfha28o2mcgcqp/26210148311.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3a2b0897b0b48c8074427f3d198a32f8/77846287370.pdfIn PDF document text
    • http://alternatifmedikal.com/img/userfiles/files/falidudog.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160ac746cb4af9---silazugofumewazog.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609668e8ea29e---2037045756.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/87f95a82d1d44e27e13e5549bba90c48/70574731962.pdfIn PDF document text
    • http://tfforming.ru/d/files/rukaguvelunapolidesiwirew.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/9ea2aadutv043n5bc3631940k6/ruxakobaj.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094092b37174---61266900441.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/xukimoxisuvaloj.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078ba89b9480---jadewekano.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/barofinepolimexulitaset.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fe3a1e53d---69209625994.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/c87b028251c6de4d887541b18c1311d2/loboxugedalajizazoxuravu.pdfIn PDF document text
    • http://mrbossamktown.com/uploads/files/91455603292.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607042a91123d---gagifalulivawi.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/93885436919.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/18213265181.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/tojiguloba.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/29905079194.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/masune.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a4aa0fcbd2c90a590b69afcfcd7c8881/40163679127.pdfIn PDF document text
    • http://herculesestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lepakerodekinud.pdfIn PDF document text
    • http://artospace.com/pics/file/26112390880.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c51dea9c38---80899038110.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=fes+rostfrei+switchbladePDF 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_off0001245a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245A 20784 bytes
SHA-256: 03172e1ceb5ac921dd43c2bad58d4096058cc12093e0467910bb89f5818226ba
font_01_sfnt_off00015a47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A47 10672 bytes
SHA-256: 74723274d3b394d05dbcf3ef27253f8288b0d37cbd1e7b0274296186a7b30c57
font_02_sfnt_off000172e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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