Malicious PDF — malware analysis report

Static analysis result for SHA-256 182e7c363a9c08a5…

MALICIOUS

PDF

93.2 KB Created: 2021-08-01 03:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31728d1a214e82230676d45189a9e8eb SHA-1: 74e3f15d86bd101e01580d65f29eb214d4e59af4 SHA-256: 182e7c363a9c08a53d060828c99112ab96492aabe96f43e908d80a99fd9ec0a8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to host a collection of links, potentially to lure users into clicking malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=autoid+network+navigator+sr-h6w+%E3%83%80%E3%82%A6%E3%83%B3%E3%83%AD%E3%83%BC%E3%83%89 PDF link annotation
    • http://brilsports.ro/userfiles/file///dewuwegofuvekato.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/49db41932bed8557c6b0c9c5fc9a7711/pajivaf.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f4b90b196---gupofozujijolafewumo.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/g3apraiecajgqgt3ftan2b1379/livoritoriredigiwuv.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/7c82abfc8ecbbdc1a314dbafcb578cd8/tukafezivovarowup.pdfIn PDF document text
    • https://luminex.pl/upload/file/bezobudosemubut.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d8c631732a---68660814846.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210628_3903BB5835A67A6E.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/21008398246.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c38a15ae979---98887010569.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/68723312144.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160afa96fa5f3a---44103027888.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/12208983899.pdfIn PDF document text
    • http://facilitymanagementassociates.com/survey/userfiles/files/dukifeduveni.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b7481eb83d9---26241037492.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c69ad00cc4200b432aa1604723c3b0e0/vidujuzosojojazuxejo.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f24d4532a5d---29809695628.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/040d0e2d9313fcda858177346cdfe174/fimuwo.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/jixonigularulitakidotes.pdfIn PDF document text
    • https://cooperspick.com/files/94686739166.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4b2eb0b07---lurosukubowedubasakaka.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/59017913527.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/45275724009.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6d2d3d5acdca8e197ffb99ad61d7d9ae/15364049923.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/kawadupiv.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BD 15964 bytes
SHA-256: 646d67370f568616c4c0ab7d31e246d350646ae7617948e53f476a79f25e395d
font_01_sfnt_off0001062a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1062A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E41 11008 bytes
SHA-256: ac0ab70775493a1bc87d5d118d33c45940b658f55c2a7af89e72f46f1f20b513
font_03_sfnt_off000137bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137BF 16668 bytes
SHA-256: f096d156763487f6218a4c6c0b09b8baf1f0c57e4715bb2303a080da779a8348

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