Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4c11ba8999526f…

MALICIOUS

PDF

77.2 KB Created: 2021-09-11 21:31:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d98ab47a97fee7a6a18425a7168d82ab SHA-1: 97a3af2b187e3e5be2299903890e9f79144216f8 SHA-256: 7f4c11ba8999526f83b07a59e8e979ba9dcac3065d17c618020c05afa9f4373a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs that point to other PDF files hosted on various domains, some of which appear to be compromised CMS uploads. This pattern is commonly used for phishing or to distribute further stages of malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://bodymason.com/user_uploads/files/woretexalinarasomagul.pdf In PDF document text
    • https://eventpro-kontraktorpameran.com/uploaded/files/82448654471.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210904_A283A464E6104F0D.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210902212446753510s071g.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/jenukibawoluk.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c85f03c2708fca617e12dadee95ffe20/pizililukewodivox.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109041356124870.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/0085e092019a4aee4513f4d885aee538/91451389026.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/91824618056.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb43514740---42033447896.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/robipuwotozudosege.pdfIn PDF document text
    • http://bumsnab.ru/uploads/files/45713232363.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/70126222226.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/depodupafalakatik.pdfIn PDF document text
    • http://interroadholland.nl/userfiles/file/32864294668.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/93901470784.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/69540622020.pdfIn PDF document text
    • http://panel2conso.com/userfiles/file/80185147811.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ab9bb7488---newojanewofexozavinab.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/16183374883.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/lomopev.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/25724945649.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613206ee3f541---81755144160.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/woketevibusimuvazem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=android+mobiles+under+10000+in+pakistanPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC638 18324 bytes
SHA-256: 32c0770a2e8b493ac63d32c17dade4fb045fa56f5b8b485094e22420655c97f2
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 11040 bytes
SHA-256: 41f797fb94ca5fac173eb4ac8935acf4fe4e78346cf3fb053fb37db4799ecc7a
font_02_sfnt_off00010f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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