Malicious PDF — malware analysis report

Static analysis result for SHA-256 f053faa059d9bc3f…

MALICIOUS

PDF

71.2 KB Created: 2021-09-21 12:00:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4ad803d3f25a69c4345f4e5ef109b632 SHA-1: 2d5c5fb0154e02ff0156c194b2bf64771cddc88e SHA-256: f053faa059d9bc3f6e10d46c0dd4647ea0e30bc006ab4060f50bfe40102419e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://synerhu.ru/uplcv?utm_term=pokemon+go+hack+free+pokecoins PDF link annotation
    • http://bowie.abwingsmd.com/uploads/files/9607102244.pdfIn PDF document text
    • https://bevillelecomte.ovh/ckfinder/userfiles/files/37864178890.pdfIn PDF document text
    • https://littleitalypizzany.com/nbloom/fckuploads/file/40170360780.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/teramabopotofed.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/32472540976.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/1944696206.pdfIn PDF document text
    • https://jpt.mysmartedu.com/uploadimages/files/zafeluwaw.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/fefakagisedivawusijudi.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/mopinojetutito.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/69236385030.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/41768243748.pdfIn PDF document text
    • http://suphammamnon.org/uploads/files/buwokiduvakinizomuke.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/epiqta9v0iatjj55q7tt7v8u1p/39260036427.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/kizinabureroroduserefe.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/wosimupazalaparezej.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161395f7fbbfe1---23265856278.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/41964654013.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/lowofozamovet.pdfIn PDF document text
    • http://sro52.ru/uploads/files/44117263034.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/viduwoxawipif.pdfIn PDF document text
    • https://vargyasnekonyveles.hu/kepek/other/file/rapusigigobosasa.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/21307448842.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305aced8d05---17753517162.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_off0000b6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6B0 15532 bytes
SHA-256: b1d1eedd8001b61c0732f53e3cc6d5e31b84e47dfc1c0acfd8bbb7a4d0fb05c1
font_01_sfnt_off0000de08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE08 10876 bytes
SHA-256: dbb55718129df6589a136d214d6c07a9afad89473039c6085aa3cda64a860488
font_02_sfnt_off0000f6fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1