Malicious PDF — malware analysis report

Static analysis result for SHA-256 312cf53f4d3f6097…

MALICIOUS

PDF

91.6 KB Created: 2021-07-08 07:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 71fea43d9dd2555b3057aec330010c7d SHA-1: f747f6905b52a01e07cf25da1be16d236200dc27 SHA-256: 312cf53f4d3f609719925139560eb9a010913c6d73b38a31d03be9a879a99703
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://gayaarchi.com/userfiles/file/20210702111231.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5d51146cb---54526866417.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/24286072177.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbe0486d88---42852163417.pdfIn PDF document text
    • http://pk.mo/userfiles/file/viwasapifuxagusu.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/6098719689.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7534e1c24d---71863227468.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/2fa004c6e833e6afa3585b70703fc3ac/loranodavizodanu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160af9c338f08f---pidelividuxetuvewupefeme.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a122a7bc1d7---xejebebemavonutenofozopu.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/dinatituma.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210531161558164.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/53871917380.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16093a76f18963---ruzibotomodalesaki.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/cqqkerggadhbghjs6eoj220cb0/wozokivomijotal.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0fd440b1eb322106f793395bb2f00d20/94047565487.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16099ec127f3a1---piziraralideroxusoji.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/jeludovi.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/f7e3b619d3c986ff5f6b7898b61ea3b6/gakit.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c72514aefdc---lipidamatamalal.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/lorimujexuwar.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/0184381821b6ac38797b7a6dcd51e3d5/pejinerij.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607b899a00709---3085195566.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=state+%26+prove+mid+point+theoremPDF 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_off00010744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10744 9540 bytes
SHA-256: aaa4e3e0d2af679ca0bac44e12202d0a9f5ed1f00760169c336f825140bd3589
font_01_sfnt_off00011be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE5 16908 bytes
SHA-256: fa178151ecb6c8a798cfe187acf124a302e2c0d130ce990c441cf22b07c015b1
font_02_sfnt_off0001481c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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