Malicious PDF — malware analysis report

Static analysis result for SHA-256 70ef43a50565d155…

MALICIOUS

PDF

82.5 KB Created: 2021-09-07 05:10:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a5a4f74552d2899e66a4ef57149ba382 SHA-1: 93f81e5bf24ac3400f34396784a8f9cad0d7af11 SHA-256: 70ef43a50565d155ad717bed81a0c82a627701292f11f2a3e7afdd688bc388dd
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with multiple heuristics indicating it functions as a link farm. The PDF contains numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or appear to be disposable hosting, suggesting a phishing or malware distribution scheme. The primary purpose appears to be directing users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aeronautike.com/userfiles/file/kifuwibujufebuxixegojiju.pdf In PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/dozomorinerofufetexi.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/4899305994.pdfIn PDF document text
    • https://mimpiindah2.com/contents//files/31061331798.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/98511263966.pdfIn PDF document text
    • http://merklink.nl/site/data/ws/files/40640914335.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/3727784702.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e616e9f06a81d4bc97c91eed448bbf90/muxafonubinegopogepuso.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/61079321955.pdfIn PDF document text
    • http://anadarkogomezfamily.com/clients/7/76/76920377ef4e0cfe2c6e77079a05cbd4/File/48133040999.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160828959f301f---88882526025.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/mowanizufaxewodazu.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/82442674661.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/92430462652.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/xawabazakatepofeka.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102d070b31d4---62751657917.pdfIn PDF document text
    • https://paeonia.ch/userfiles/files/xuvoxutifo.pdfIn PDF document text
    • https://twfern.org/upload/ckfinder_temp/files/20210529013422.pdfIn PDF document text
    • https://kaisar168.com/contents//files/zofoguwesune.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/b6dbcc650fbd10c2b93ae977e3466264/27482858349.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/59341273191.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/busuputuve.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/91899808695.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16080d2599663d---pizumajulowomesedujelav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=quacks+of+quedlinburg+herb+witches+rules+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 11520 bytes
SHA-256: 27eb1d95ed156367699096e9b94c4e1aac2f64dc42ba45831e244be6bf48fb1b
font_01_sfnt_off0000f14d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001095f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095F 19344 bytes
SHA-256: 2305bb464d95a77a00bb5364c00854d83dd0d5eabf7ef6f68f0709eecaa9e525

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