Malicious PDF — malware analysis report

Static analysis result for SHA-256 b52156fbf8577d97…

MALICIOUS

PDF

100.7 KB Created: 2021-06-26 02:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 788d92ad497285c5ba40aa03fa5c1c5d SHA-1: eeecc4b76065787150eaa81321c5dc7aed9ac2f7 SHA-256: b52156fbf8577d974b50554fd6267fd60387620c1d9a056dd84b0fa54354ce9f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, evidenced by numerous embedded URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of a link farm suggests the document's purpose is to redirect users to external malicious content, likely a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

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://laborke.ru/uplcv?utm_term=sims+freeplay+hack+ios+2019 PDF link annotation
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2205d44a4---kumozifibitigajudov.pdfIn PDF document text
    • https://drivetripper.com/userfiles2020/files/tabutibidibabusefuv.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/vrl4rdu7joqguoafca46qd64i3/xabuzolerura.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160757ac8a2609---kilukosu.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073b95611eab---59135148423.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/6c4tmm2vm56ovpnkbs1p8ngav1/23921240036.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/kogifek.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/87b8b19b4318cc6b7f05255ff6e63fbb/48135822584.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/sapidisubuwu.pdfIn PDF document text
    • http://csptech.net/admin/userfiles/file/zipunuveromi.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/pnu7p5ub23bb6vng75hiui0gue/44538087903.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/63653189677.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/c79807a4f5d0a354bd691ea72d6f38ca/25824611031.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/jakofobutewenapuxajet.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/83143c9d2029d2c7a24ee2c159193669/34551592683.pdfIn PDF document text
    • https://craftsmancuttingdies.com/wp-content/plugins/super-forms/uploads/php/files/e301bfcsh2r36f24h833ih2o78/bafaboguliragedamagamenar.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607269069d548---lubigaradilob.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jqb8b78cplviqg1qvmi2r4ogq6/wojuxa.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/a7a2d29ea2f2ae65119d0e134c4521fc/36197044884.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c2d7a44bc---guraramodaxofufoje.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b46515d1fab---xoluf.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/pajapudu.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/30403170314.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/83931438632.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/kejeto.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/d054bd333d2bc7cc9711da822247605a/81296100733.pdfIn PDF document text
    • 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_off0001275a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1275A 16716 bytes
SHA-256: 35ae5156196374ce4bc7c1e8de10893dc7eefe608acb2f8e57e416abea08b85d
font_01_sfnt_off000152a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016abe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ABE 11284 bytes
SHA-256: 537a56bb42fbbbed3fe5fc2656be312f62a1391efc46c807d0cd57a1512b7bf4

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