Malicious PDF — malware analysis report

Static analysis result for SHA-256 e729a94af398efe6…

MALICIOUS

PDF

173.8 KB Created: 2021-06-28 10:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4687d31a1316ecc9c78d5b12a3e4f0b7 SHA-1: 1f1232e3b78781456dcd16320e4ba06c8b7da9f9 SHA-256: e729a94af398efe6f4260db5e74cd43f6ff156291b465925737c8cfe720d4477
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple distinct hosts, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous external URIs and link farm heuristics points to a tactic of obscuring the final malicious destination through a series of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9428

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://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/49102b91cbffbe39d7adb9f21b7d73de/10236910846.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba54c511ce6---vuperak.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0333cbb373215da11cd2b759f10f5d3f/dagelugolakis.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d64caae58---nixuxivugud.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16075edc143497---niriwabewitipubikut.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/60535602666.pdfIn PDF document text
    • https://actor-conseil.com/files/file/7268008130.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725565e1352---1645503246.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/zufabazigubapuzizano.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a208349739f---lozuwadimisotesebokol.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/58729187399.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a352df973---3165649340.pdfIn PDF document text
    • http://domusanna.it/userfiles/files/84303239489.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/161a3bf4ebcdf4fd358d4f7f9d14f350/5513938340.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607597be156cf---nevosiniwowupozenaxu.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/78b2bb454c09a124307e1be476eedfe5/mexeluvidizibovib.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/e4fae7586f865909f97d4e558c63ead3/93253011775.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/17535944658.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/6ad7da3769f522e135d8db0fe8013fd9/zekevisabinejo.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/49c8ea0f8e59ce347ef41b5091a1ee3a/zegebudi.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606e56e5d1b05---8262451945.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be91c811e2a---93113956731.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab71d6a9bc2---raniwofosanin.pdfIn PDF document text
    • http://kistours.hu/userfiles/file/36918355520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=sooyoung+and+jessicaPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001fa77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA77 16216 bytes
SHA-256: 8c2e9d80d580d08964a5048de7b59c27befd741f1c379efd0abbd599686b3e88
font_02_sfnt_off00021025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21025 10720 bytes
SHA-256: 29562cc0a0796a68043e94bdae9797d450071799a20381682f3fda92c899e91f
font_03_sfnt_off000228a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x228A7 20508 bytes
SHA-256: e7074b866bc629749011bf525792b0d8cfcfd0ecb3f859a9ce5a02d536b11698
font_04_sfnt_off00025cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25CC5 26320 bytes
SHA-256: eab0dcc7a60c1a91c91290fae2026679d1b7dcbe649875fee7d8b87e9b9ca0e6

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