Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb225c83481b0e0…

MALICIOUS

PDF

90.7 KB Created: 2021-07-06 22:38:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: dc1508ff5a80abdc9c7b090acf23c7ef SHA-1: 68ca3ca8d7f199100b98e1a82cc7f0b5c80e0db2 SHA-256: 5cb225c83481b0e0236c3811c5ff7d3c23ceccd9ea3489e9317a49b8795a94ef
164 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to disposable domains, suggesting a link farm or SEO poisoning tactic to lure users. The presence of a 'Download' button heuristic further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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
  • 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://rosniyom.com/userfiles/files/vekakemisivupi.pdf In PDF document text
    • http://dezmaster.com/userfiles/file/pabosirotama.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/ibhec0sutjvgfj65r4g0chst89/vekokawawedubirefu.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8b4f88736342b6f3f39321d15691cada/56641437491.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/gibaxutuxapepulo.pdfIn PDF document text
    • http://7tec.ru/userfiles/files/tetuvovefexusufa.pdfIn PDF document text
    • https://invest.pl/userfiles/file/87098257761.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/a3toftdt4bhl19r0qsnrt7c00m/54867336687.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/kunamadoru.pdfIn PDF document text
    • http://euro-ex.com/images/blog//file/61576219161.pdfIn PDF document text
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/mifofawabigiledodedigike.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077f821c5d5d---71301502019.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeb9c126c43---dilupalunofamiza.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/8878807618.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5bcbacdece4d6f4065dd1e2c2539b851/64606421037.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086a5d46514c---labukuzas.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806a1f8b88f---64091349702.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/jewisinuzikufunotevik.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/113a475c48a57675c86c2d2dde707b19/femorelolanategezir.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/puwoxixunuvek.pdfIn PDF document text
    • https://brawlcall.com/ckfinder/userfiles/files/31464826124.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4a01975a00---70852800496.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=excel+to+pdf+converter+portablePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 10644 bytes
SHA-256: 326e9aef75c175f09e197d53df816f1f2ad558d468ada4f99495d4fdebca1d6f
font_01_sfnt_off00010497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10497 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off00011a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A12 16572 bytes
SHA-256: 97e295771215332d05007d6b1a727e72f05d465e90ee2b84cd3f4260a64bc7bf
font_03_sfnt_off00014533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14533 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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