Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4555d5e616b0e1…

MALICIOUS

PDF

78.8 KB Created: 2021-09-16 07:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0bd72ef219c6e4f0a7610e6b43416d22 SHA-1: c25c83cd123d1ad6d584a607c7ab92a750cfea02 SHA-256: 9c4555d5e616b0e19885e51305583b93869f12c2cbd2d5bd1450d6a3871b28a6
184 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites and disposable domains, suggesting a link farm designed to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://tofuyatogo.com/uploads/files/tikebebuved.pdf In PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-9/20210909051812209808.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614264a9bc1fa---34618666311.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/kisuresipaje.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/62584266663.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/gebuwukurezutiv.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021091108471073499.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/58946533482.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210903031459909943999.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/xirotarupilusizu.pdfIn PDF document text
    • http://brenna-ski.pl/userfiles/file/56151462361.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/82266021854.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/51270664554.pdfIn PDF document text
    • http://boxethai38.com/upload/file/85974134411.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16136816202580---4194758804.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/vibinutibasuxosoramunabil.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/19130396869.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/51934113524.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/robolitulinasaje.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/fezutobafur.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea45b5ce3---61285665369.pdfPDF link annotation
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/0ec0b54292f2d5dceaec05cdb01e92b3/nubakiwivofowivelet.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/20409142143.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/10836283194.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=helium+backup+locationPDF link annotation
    • 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_off0000cd25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 10592 bytes
SHA-256: 6e22167566bad4c11af79c39014fb40bf0da78956b8a1659f8f88083c7de58ed
font_02_sfnt_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 18384 bytes
SHA-256: e2549ca69e793712d385b27da753788a4fa950bfaee127f7c31a2353053620a7

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