Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5f0dc355bde8a5…

MALICIOUS

PDF

88.1 KB Created: 2021-09-22 23:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 75970cc25af7f4dd13063c75fec58814 SHA-1: 4191b36def8bd91ad05db24d31348a18eff2d278 SHA-256: 9e5f0dc355bde8a57118c1b124e10c0da06e56e576bb91406698ff0fbefbded8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to various URLs, some of which are on compromised WordPress sites, suggesting an attempt to obscure the true destination. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://wastran.ru/uplcv?utm_term=android+frp+unlock+tool+for+pc PDF link annotation
    • http://hakanhurdacilik.com/userfiles/file/puserawo.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/98017216490.pdfIn PDF document text
    • http://cherryontop.pl/upload/fotki/file/karazupobusivetupabuxu.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/23451166097.pdfIn PDF document text
    • http://stringladies.cz/userfiles/14821052898.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/jelolonugoxiberigudop.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/70735624190.pdfIn PDF document text
    • http://goldia.cz/data/file/wetegevonimifamija.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/p3sn9rqrm44ab58k5emr14li58/32128127961.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/44969481961.pdfIn PDF document text
    • http://tfforming.ru/d/files/52417266509.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/3092e4f605e0c62179a4db91cd86d667/4583415302.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/wisub.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/nunawagotog.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/11262637116.pdfIn PDF document text
    • http://veitali.com/upload/files/wuniwosifola.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/43760026694.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/052a2872b16d94aaa5bd678752232437/gusesavekobixugikinewug.pdfIn PDF document text
    • https://ladida.asia/sporlegen/administrator/imagetempfile/87579726301.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/nofilazugivisubiw.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/77068567955.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///66906328936.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/zisujas.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/julomane.pdfIn PDF document text
    • http://rentbucharest.net/images/userfiles/97289427301.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_off0000f485.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF485 18068 bytes
SHA-256: 1d55493305aa3da2f9e6545608ac43f08137292f9770dcf4c8313ddd0f6ffcf1
font_01_sfnt_off00012324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B3B 10324 bytes
SHA-256: ee1187c54ac23557320743259fc7208672ead37a995e100be5be274a170d7d23

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