Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3c57c23add33ae…

MALICIOUS

PDF

68.8 KB Created: 2021-05-12 22:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 3d17ed001f04241c2d29a0b63396bf00 SHA-1: 0051e108241088df42fadaa53a7641979dcf06a3 SHA-256: 7a3c57c23add33aea5ff4f2b0874da8abcf4ba4d7853fe1e37d965d2c1f937fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous URLs, many of which point to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The document body text is largely unreadable due to encoding issues, but the presence of 'character design sheet pdf' and the URL structure indicate a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608f95e9d4b25---tomukamezunikevexinidu.pdf In PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a568d8590---50958653300.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/3ei7r6dussc2vme2ckh0fjll5b/4388076891.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c90f41cc3---10404252614.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fj5s32o8k7ighie8d5aseofp6t/11240644131.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/77526807145.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9459b90a---36677966968.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/q4i2dmrj8g4db3raea7edef8nl/fuvibegakobibuxupimun.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/3c3c9b188c92f16ae0d43544327eaf1d/komawenemodanujasavu.pdfIn PDF document text
    • https://amitadevnani.com/userfiles/file/dojiledupazinojinosepire.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/8gm8d4i83erl7aersbl24j8s4m/kejiranidixidepepikanura.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160948930214ee---18818081024.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/8b13d1ae4d8dfe719d9906b7f188483c/kekaxexalatuwifiji.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/61dvq9aqouaq8vnr0pvqb13o40/wurudezo.pdfIn PDF document text
    • http://project-lovcen.me/userfiles/file/84171553777.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/f9c5765708b05079865c7c180c94e129/30942736516.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079621429cd2---kabiboworuvobiguzim.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=character+design+sheet+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FD 5292 bytes
SHA-256: 8de4989b0a54bf097cfbbbfdb078068fb93bab80ede271274a856ffa67262c8b
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 10488 bytes
SHA-256: ba25286d3a3586c588064f70546c2d934095e1569f10a933aeeea5e85dcd98b5