Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a3276d7717e361…

MALICIOUS

PDF

90.7 KB Created: 2021-07-03 17:18:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 03d8ff27a48d174f459892c747dd9ba9 SHA-1: 3a1259604a1c7ac12c0127e5b15f9bacaccb2ff7 SHA-256: 21a3276d7717e361573d31414ba6742748aa0274d58c646e6bfa69c61a208a77
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 unknown PDFs hosted on compromised websites. Heuristics indicate this is a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/aa466e5ed554dca294eae42e6fb749c6/90685414204.pdf In PDF document text
    • https://actor-conseil.com/files/file/luneralolikizitosokur.pdfIn PDF document text
    • https://bojovicsirogojno.com//files/xipegizogikopefelu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607b818e096f9---vezasad.pdfIn PDF document text
    • http://zpkprzemysl.pl/ckfinder/userfiles/files/kulowevote.pdfIn PDF document text
    • http://megaprestige.ru/uploads/files/pivumodazuru.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160816876ccd78---54225035976.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pa6lmss9hlglq9tqo6vscc7d74/fasukepumuzepomuvasivat.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/160714f25799c4---83172006232.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/piramopilu.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b51d6131c4---ruxamawolugaluvot.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/511a51bfbbd9a3ae96d1c9265a511127/wixukem.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7c5e00745---wijusowinopogepelilubizu.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/rowojibabipu.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6dfd137829c23839432e1c9022074e99/22851141272.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c65dcce3f92---54264685116.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da23224e5d---bufarum.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/4a55b52735ccdff36759eea77cbf0f45/ludokopumeboxixa.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/aefe21222e626d182038a978e08a5a44/11726848149.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/44219625117.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/3jeq39inlbff8iiqkqkgglt1ji/32621106006.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=advanced+manufacturing+process+mcqsPDF 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_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 11212 bytes
SHA-256: 8fcbf44e42433c26688a4e0be5c027137ad7e990c1c478abd12ade6de624aa9f
font_01_sfnt_off00011585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11585 18380 bytes
SHA-256: 3caab533ba97f672f66d5f3a89b818f2227b53c46960b54ea6c26450b6592d6a
font_02_sfnt_off000145c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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