Malicious PDF — malware analysis report

Static analysis result for SHA-256 4143c531208942e3…

MALICIOUS

PDF

95.8 KB Created: 2021-09-02 09:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0c639746363b0c1316621fcbe8404d1e SHA-1: 3206876214a55f229b46f55733bdffbabbfca924 SHA-256: 4143c531208942e347388576c79ae9346fa3d4cf6b3b7335ae7810613d5b2af1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to websites hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or redirecting users to malicious content. No scripts were extracted, but the structure suggests a link farm designed to distribute traffic to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/8n9e6b83ra9gv0tbsohmhfurse/wudogiwudorip.pdf In PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/gukarapege.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4fbabf1083---63901656641.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/6u200fu5gbtv2224ik030t2b84/fuzavepapilenexu.pdfIn PDF document text
    • http://hasyo.net/files/file/veruzamuwaroruximopurubas.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/74016988362.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/bdd33b785efbaa7aaeab417f07b6e44a/bopowizuzado.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/dijojofusinosikotobefe.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/29329290423.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/a961089f4a6684b54897470ef8921f00/birenavumano.pdfIn PDF document text
    • http://grupophi.es/uploads/files/zawezesopafedisux.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/e1678dc1c031a590fc814484db4b11a8/nevom.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/c73f3c45261d43a37a92688240839fe2/36117963360.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/49893746265.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/44029026010.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d7106aa7a8643b8eaa2825d0052f61a/badovasirenanubu.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5e297f73bbb410d9ac9242cc9c17ba9d/10145875074.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/f97484f7231eb22d302461ac9c1195a2/55776827708.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab2f2f1dbd6---nurubilijizepuvubovag.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/hal881f7t2vt981ju2vthcm6m0/12891542095.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084ee2f58c78---69473267219.pdfIn PDF document text
    • http://phuongsen.com/img-chamthi/files/dovireredemeke.pdfIn PDF document text
    • http://ilovegabal.net/fckeditor/_upload/file/37467144760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=creating+halftones+in+photoshopPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001278f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1278F 10668 bytes
SHA-256: 0e808c18c7a8a5dcd8e47325da92fb33b64fe0b1331d1f471ef926493187d071
font_02_sfnt_off00013ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF1 18448 bytes
SHA-256: 6c43e95a74a4bdb898786e750bd17d19fba83ac6921ef5c5856e2d3cafc4feff

Open this report in the interactive analyzer, or submit your own file for analysis.