Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1db2be26d25a2fa…

MALICIOUS

PDF

79.6 KB Created: 2021-09-14 01:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab58b346d22ce173b5c89487501f1d3d SHA-1: 532123cf025ea60d602b33073681b04bd555a5a9 SHA-256: f1db2be26d25a2fa822ef194d540cf0641c58d8a04644478b8c92f7e85231a52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=kitchen+scramble+mod+apk+unlimited+money PDF link annotation
    • http://mastrodibaglio.it/userfiles/files/5283964123.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/jibatuzupobujabavadezize.pdfIn PDF document text
    • https://pmeds.us/userfiles/file/81284097910.pdfIn PDF document text
    • http://badgerhillfarm.uk/28755271530.pdfIn PDF document text
    • https://fundacjaartfreeart.pl/userfiles/file/roguwuzapimunusowave.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/59701341313.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/800191729.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fff088409---40261561738.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021911164713.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/bozikavinapuwuvodoriw.pdfIn PDF document text
    • http://state-lithium.com/upload/files/mununajanezifalaxutilep.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6a9398c9---fejanixekalokalex.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/52669051355.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/16821574057.pdfIn PDF document text
    • http://yejiya.com/userfiles/file/vedudo.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/lumivabamiwadasezudokipu.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/zututela.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ufpd4g0uvbs20gg6fftid8nu45/48325492858.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/53942499836.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161322da3dec5d---fefozufanuwogamewedodub.pdfIn PDF document text
    • https://parfumzone.ro/files/file/tazanamevigirefojimon.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/rudovibemiwobomanevik.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090905235645.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_off0000d1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D8 17340 bytes
SHA-256: e163dd9043ae6b27635b39069180bb337de40826fe92f64a640d897e794bac64
font_01_sfnt_off0000fea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000116b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B7 11216 bytes
SHA-256: 61db29e5ebb13c9c812f0b3238211c2fcd69bc8df1bd4ae1aa5fea2f71d44349

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