Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c2c8088b8c4c648…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 04:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1e18a9aa3918c5ece4a3370c17fd1d6d SHA-1: b19591a58328b481bc4c51be523f93a0e8745913 SHA-256: 8c2c8088b8c4c6487f1fb1ce6ea9581a2a4331513c40bb07e34162bcf307eeaa
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve as a downloader for further payloads. The presence of a 'download button' lure reinforces this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • 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 http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc055b3770---libuvivafob.pdf In PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/a064e8828b64658ff04314a5838e6775/64295744500.pdfIn PDF document text
    • http://brukbet.com/user_images/file/71702671397.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dec8b06d899---76611348246.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c80a661ba2---39230285961.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/bajemaxexiseluzu.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/dibazug.pdfIn PDF document text
    • http://dodogs.ru/sites/default/files/file/suwisibepek.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/koxejijezanonibipodiwamo.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/d51025e0b1062f9f6169527c1e048c5a/3139600057.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/20087403689.pdfIn PDF document text
    • http://teledirk.com/d/files/losupunesuwobedino.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc1ac873f1---46762411227.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/rnteuq268m8969h3gpjm4t5cbh/48788653719.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ddb07f910---juzibivagasifafojot.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6cb67ee92---waxenuwezanepojarip.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/74053590118.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/94329525642.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084e8c886d4a---97068895058.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/19049289606.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084a01bca07c---dutovokorosuriladamow.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/25600012180.pdfIn PDF document text
    • http://bethanybaptistcolumbus.org/clients/75549/File/diligopekevefevoxizef.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/4334m499d8vdkscvjeb7ap5k83/pobaf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=sonos+move+manualePDF 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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 18680 bytes
SHA-256: df25c9337857506d9b6d726a039569f0e3c04bd596eb0a10dde73c564ab42fef
font_01_sfnt_off00010d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001253f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1253F 10220 bytes
SHA-256: e4a92625249ffd7fcff80d4eb88420bceb158f003a64b64a2060c24e8254bf51