Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bce281412ffafbe…

MALICIOUS

PDF

88.9 KB Created: 2021-07-21 21:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ef10d8ea5d070ff02ac880d04d5b89a2 SHA-1: 89e621388ee0eabcfda78c620235415b8be56176 SHA-256: 7bce281412ffafbe21ee0d2969a1767fb091abf65ea57e53e73e60214ccaf8d7
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://libertyquad72.fr/userfiles/file/najetedod.pdf In PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160726507134f2---43644554725.pdfIn PDF document text
    • http://74ahs.com/clients/2/2a/2a132ee8da0778863662fd4b1fa251ed/File/mibigusetugozojexopepavep.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/28208400023.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/16177405536.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vjt5uvs1obkoqa23fbh1cq7bc3/18659386337.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16086e8a7afe83---68197021461.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160709db4141d6---13533672382.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/99201508175.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/jq7khm17fifcdl2ab3n2gnkb54/fejasoko.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/688aa24664166449532c3ce4b8db05c7/40593148897.pdfIn PDF document text
    • https://smilepaper.tw/archive/upload/files/niwupufagabe.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/7883330402.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/cc819c8ee02c3dd0f57a51799aac073b/62155090237.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1a672a4cd5---46006214346.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/draiulgb19hr11imsd7eigrmf8/88056418363.pdfIn PDF document text
    • https://nhakhoaanphuoc.vn/uploads/files/tekasi.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/ca9f637bfd5d0384e808420f71534aa0/jebavapokotipanotadojow.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ee87a9d4151---wanumumatuw.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/41705ae2d696561a5a3f9b565bcf077f/69166374720.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f2b9d3091---xemejomubiwasotinunona.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210530124829920.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/83ba483a1c7819dcf9d11b58d0333e40/gojeke.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/46787c1153d84a1f920a885a71dcf062/vojelex.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/zakoxonavikurowetobakures.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/4bvkhvk5vfb2ok18d3g5ind7ve/4095768025.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b470d9422ee---wuvusarowifaminegalujex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=causes+and+effects+of+environmental+problemsPDF 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_off0000f81a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 16676 bytes
SHA-256: dfae4fb69a4a01ca3f09769fe6137fb726d9b3c3eae30386b871c4d29202577c
font_02_sfnt_off00013b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B84 11120 bytes
SHA-256: 2b920b6fecd8f4b88234d9f364e653c936156fab6742b20aa893a0f836377eb9

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