Malicious PDF — malware analysis report

Static analysis result for SHA-256 645c800e859ee0fa…

MALICIOUS

PDF

91.8 KB Created: 2021-06-30 06:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2026-06-05
MD5: c1a1e872085dff38f8ead22f87de5bd4 SHA-1: 37192394553fa7fc075b6dcec62e815857a673a4 SHA-256: 645c800e859ee0fa315b288091dfeed35df85f80f748606cfb24c8588e28fb84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the link farm structure is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://hanasushipickup.com/uploads/files/wefoxutofenudebig.pdf In PDF document text
    • https://feltshoe.com/userfiles/file/31076210062.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078179cdc4d5---61514427658.pdfIn PDF document text
    • http://k-souz.com/userfiles/file/20213758118.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1608d78f6aca70---motaluxobufijopafu.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609b530aec353---vowozu.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/30962984596.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16076ab615b610---14506024031.pdfIn PDF document text
    • http://cdio.vn/uploads/userfiles/file/fedivepiruduxupavubomufo.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/wuwifexovir.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/51731161450.pdfIn PDF document text
    • http://apcmagon.com/userfiles/rasabavi.pdfIn PDF document text
    • http://zjpjxt.cn/upload/uploadfile/file/44630217494.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609165d2c2669---pikefumiwavuruwutewoso.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b028b874c2---50631872104.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160775d0ed50ab---mokabifopizin.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/76715299292.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/57fs03hi11ps28jcg9btktba14/16456309575.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ceab14c2ed5---24577761980.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/vuzudaxigemozasariwe.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/wutumenekoxoresas.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/a34ef31db42ce2abc543533601b62dde/34188539277.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/45977166280.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/58df59a364a8027f3f6bb2864ae766f1/lidalimog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=diy+slime+without+contact+solutionPDF 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_off0000eb03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB03 18936 bytes
SHA-256: 97dec0053c7e1275c40f28ea0c71e52dff205ed668b2b4cbc9f5e6baef1582e4
font_01_sfnt_off00011ab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB4 10696 bytes
SHA-256: 535c2f3ae87c6e2efe2bad3a849ab3d80d3e7742f93d5f5fbb1106364873c2c0
font_02_sfnt_off00013324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B35 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae

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