Malicious PDF — malware analysis report

Static analysis result for SHA-256 18aff5fb221c96dc…

MALICIOUS

PDF

76.7 KB Created: 2021-08-31 03:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 80274e1d86518632b4f10bd615a2384e SHA-1: 67b5b3e4800b57f71f2341d86d8223b51f6f2eb6 SHA-256: 18aff5fb221c96dc9c5f0dc93e5f096b4a9028b9486e1ea08cd1450393f7865e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains. This indicates the document is likely part of a phishing or spam campaign, using a link farm to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • 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 https://crewmak.ru/uplcv?utm_term=what+is+an+f+score+in+statistics PDF link annotation
    • http://abwingsmd.com/uploads/files/jukole.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/ff3ac4p8qr30ujufimlaad6tnk/89861910083.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086036343166---numenojunovilakekeme.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/0ql6hfvkt9f20nni9dul6teebg/87168011966.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/9b33bf42e7efbc381d06052b32c72339/refozakuketoparefatu.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb23df45e52---68281957604.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/e49351d32575a0213c7e8f8bed5be697/kezadejivun.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/gebikijobowiwabuvubewetuf.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/50317031840.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/sowonuloxifepek.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/vadelemaxafuzubisomidi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ktasrpribv7g4effjsbhnueh3m/bufaroroluket.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/xugalalogiregop.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/14860205717.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/nibojafusolaj.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/fc46d613d2e0a5662a24d25ed1910b14/67178541134.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a119d17f714---reloniw.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a341a971f---22303498229.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/52519805209.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/96145931675.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/zibojuxezewewigavuwe.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8bb58254c74909ade4decc57ce6ce379/lopitorimubamupidifipiru.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160dad43291c07---reluluda.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/24471385787.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/barulorekefigolido.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cb69a007b349b6d41873a746f6e37c61/wobujunabinofiwasemodimu.pdfIn PDF document text
    • http://aktien-analyse.de/images/File/bumopeluxilawaluvuluw.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_off0000c630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC630 10380 bytes
SHA-256: 66af8e551b9169ef6a802eff14c96d70a86e90ef4da9fe39416ab5ea0b1557e4
font_01_sfnt_off0000ddb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f5c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C2 17696 bytes
SHA-256: 86dbfbcc839736134cca4d255516b7b1f9982129e69fc37b8129998143cb5c12

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