Malicious PDF — malware analysis report

Static analysis result for SHA-256 654bf3977399c1c4…

MALICIOUS

PDF

85.5 KB Created: 2021-06-28 04:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a1ab7c8b0b7c5ac34f02c76b83634d41 SHA-1: b9b0b9c3500df9c00a455272d78dca325ebe0351 SHA-256: 654bf3977399c1c40811246651dce144667d57a1dcb36fe897cb27960e628bb5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to host or redirect to malicious content. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a284c12c17d5c60da74a5e6e8d8d2ef9/jarofew.pdf In PDF document text
    • http://vimar.ua/userfiles/files/52746242284.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/8f112d36f192175cc52b971a0293a98c/fojopemavulufezudixib.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/97164b817e70719dc6b51fe01c083287/2217285845.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2vja91aa83u3p4fp2e5j1sugd2/34555601017.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/16097dc36a2967---naberita.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/43128091698.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/14983799440.pdfIn PDF document text
    • https://maisonforville.be/documents/file/tifuzasasujopaduvisebobak.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c05a879b---38978398868.pdfIn PDF document text
    • http://www.kymkarajok.net/tiedostot/files/gorurexikev.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa89b8bd73b---41341595932.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f22774f556---83538978266.pdfIn PDF document text
    • http://bscartridge.com/pic/42325878223.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba69d7b665---jabekoxorala.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097829c0a5d5---zaxepisosogebifuzemirawe.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/653c7ce5e9e09c765c9125e06b12908e/68166250029.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9b86bea7d70657457b9c71d064d32288/piwenojipubidatobav.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/85483e1fef653b5cc7a2b9104689980f/bomesolenosuvapadoxuxotez.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1189d22bf---lijif.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609549084b729---nobolovonaratipu.pdfIn PDF document text
    • http://citra.cl/userfiles/file/zopulumak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=modern+systems+analysis+and+design+7th+edition+pdfPDF 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_off0000ec10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010427.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10427 11104 bytes
SHA-256: 73247cbcaa3a42b2a0dfd4135d221af835c8dcdd62e4caf04e3024a38066fc44
font_02_sfnt_off00011daf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAF 16724 bytes
SHA-256: 0ca7c49cca027dfc4ce714bfeac7fffded273788d467bee73111a3b7189ac370

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