Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7cf53a35a80ed6…

MALICIOUS

PDF

93.5 KB Created: 2021-09-16 08:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c808b36003df3bb5c3e92dc3890d356 SHA-1: 286c1500cb4fa16e077c7242f64bebda0371236d SHA-256: 8f7cf53a35a80ed6e2186a79218dba53286f75f0c45efabd8e0b5a3e9f448403
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable domains, indicating a link farm designed to lure users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the URL structure itself is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://philabc.ru/uplcv?utm_term=sonic+1+ios+cheats PDF link annotation
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/835f4d68ab2b4dbd545af3a5c5ee84a9/46329562527.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631161745.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/26252944247.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/puzipujenegexiralurip.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/88e1f8de00d6fade4ca342b595dd0549/28157947236.pdfIn PDF document text
    • http://atomicattack.com/atomic/fckimages/file/24578811312.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/basevedaruvexaturoxe.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/damevudaginesizi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b781447b1e---4315789438.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16138d3db57a6c---1220146976.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210901232644.pdfIn PDF document text
    • https://atiksigorta.com/files/munukamorefupomulo.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/zemibene.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/40910984049.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/makesuwoto.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308beb1ecef---wogetapejexogukabilimela.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/16513274289.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/1888351427.pdfIn PDF document text
    • http://goozzl.com/userfiles/files/tosugoz.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/zudurowebufokifelinonuj.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/17267450411.pdfIn PDF document text
    • http://homeopathyhk.com/files/boviweladazapofe.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed3a483982---mavemefodazu.pdfIn PDF document text
    • http://protetyka-lublin.com/images/wyswig_images/file/davorigut.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_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 20032 bytes
SHA-256: 2defab070e6d156a5aecce6c1fdd4c9dc019437415156e1ae1000cbde1b3fc38
font_01_sfnt_off000138f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F6 10308 bytes
SHA-256: 3face8ad3e2bce7efe472abe2bec9545a5d5fa075c399fb2387fbecce87d516a
font_02_sfnt_off0001502c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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