Malicious PDF — malware analysis report

Static analysis result for SHA-256 f756c3dc9c6037fb…

MALICIOUS

PDF

80.4 KB Created: 2021-09-02 13:23:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06d482ab6aa81ee284e5d662db687af7 SHA-1: fae1b65283556e0a801acca9f60db315511a261c SHA-256: f756c3dc9c6037fbfeb7e0b568d7a1579396c4cb0e40ec964620a7b00a436e84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites. Several of these URLs are hosted on compromised WordPress sites, suggesting an attempt to leverage legitimate but compromised infrastructure for malicious purposes. The presence of external URIs and link farm characteristics indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=prensa+tijolo+ecologico+manual+pdf PDF link annotation
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083a34f992af---33822816934.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/silamodazenusimowa.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/zenikexus.pdfIn PDF document text
    • http://checopharma.com/upload/files/3926204143.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/dejixu.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b165ed9165a---24844688432.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/0ac39c42c4821470ee0ed29e0511ad2a/84307364795.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/h2vs5cqg4mqlhr9qgmkreubcrp/vedulujoboxusilupawomika.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/5a478918cdbde1333105f104706bc156/firotarajuzifodoxurofegip.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/64532017913.pdfIn PDF document text
    • http://ybshajiang.com/userfiles/file/2021-08-20/2108200308248627104aj4504tjkrw.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/93999004490.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/tuzabalakuwelokut.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/94528306114.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/63261783191.pdfIn PDF document text
    • https://jetaime-shop.com/files/tugavovamumetitugudove.pdfIn PDF document text
    • https://tch.lu/files/files/23746891046.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/badaaa8aa45ed2a023febd6badc62715/49754753570.pdfIn PDF document text
    • http://calisnt.com/uploads/files/labanelozafolobi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/wevetusowidakidakanive.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/48975369610.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/tm4eubm9j96vmirf24sc9nk974/94999632563.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_off0000d1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BE 11196 bytes
SHA-256: da78774f1ccf7159a46177b1b8cb00a59f8bc5a4c3df393db597168ca4c26706
font_02_sfnt_off000103b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103B4 17892 bytes
SHA-256: 8dfd3541ca6f570a5bd1b88bb0d4bb4f478294771acce31b583614b3daabcf23

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