Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b2256f76e92614…

MALICIOUS

PDF

98.7 KB Created: 2021-08-08 19:53:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0e4c7958b65b35d80da3e50e1af5d51f SHA-1: 1bbd435aef69296c7ed3db6252c674d836fe4475 SHA-256: b1b2256f76e9261439f93cd406f0d5b364dae4a09f77403fb42033f6257b9478
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, many of which point to other PDF files hosted on various domains. Heuristics indicate these are link farms, with some hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the URL structure and heuristic firings are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=chanson+je+suis+au+cp+paroles PDF link annotation
    • https://balbok.net/admin/ckfinder/userfiles/files/gadadijegalodudi.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/zokekoret.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/nimifix.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/82184688661.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/f506fadaa8eb2a600d09b6d56368059d/48392969851.pdfIn PDF document text
    • http://mountcalvary76.com/clients/9/90/9062e1c9f2360b2cedac6e2854879500/File/96729787601.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/kenisegibamelinigekasufo.pdfIn PDF document text
    • https://inifd.london/uploads/file/66264780164.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/sugeduzasotuxasewatuki.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13aabc7c2c---vusezigasuru.pdfIn PDF document text
    • http://hrudolf.com/userfiles/41608635987.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210701_03F61F19A579B3E5.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa52868daa7---xidopufifiloj.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/eac204063f54d64abfe2bfc6b24b7896/zorusaveda.pdfIn PDF document text
    • https://juniorclublivorno.com/sitonews/images_upload/files/sojojadaxadusakisegoraki.pdfIn PDF document text
    • http://cybernet.asia/UserFiles/File/sugox.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///nevobekexebozutojad.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/kuona9v54vj4o3sb13jn1dhtt4/73849362359.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/gizuxewukudabonerul.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/5b6vqmit56pf55u1b2e3sktlsg/11465588756.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5fbe424c---bodixogemuvibuzumefud.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160de695dca309---31905266273.pdfIn PDF document text
    • http://flexa.cz/docs/file/21642253801.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/puposade.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4d6983ffb---rikesonunateg.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_off00011721.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11721 20024 bytes
SHA-256: fd2c87bfad4c92e3c86981162b4eaaf5694554f7783b8fca5812d20904ae5e6d
font_01_sfnt_off000149fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16215 10636 bytes
SHA-256: 7ce3177cbcc078ed87d325f252b7e50a52acaaf1cdd93a93afba7295eb4f2dce

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