Malicious PDF — malware analysis report

Static analysis result for SHA-256 fde25c8b981de8a6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-05 07:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01693d1d111dfb1a0a9beb32e6d44533 SHA-1: 5ae8a236c9eed815b5a80ccc704ab030857bc55c SHA-256: fde25c8b981de8a67152d68f808eac441ef8fffd62c141e0a92cfd2493d538ab
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics and the overall structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2h9482dlv64gooror2bmefa0ju/dewidajepudumo.pdf In PDF document text
    • https://hoangphatdanang.com/uploads/image/files/52162008515.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/36493976126.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607068e31d0d2---77170719400.pdfIn PDF document text
    • https://kham.vn/userfiles/file/12833158496.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f19e9439589---39635380979.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5e0a9c58a---gexemigu.pdfIn PDF document text
    • http://watsonwilliamsreunion.com/clients/82103/File/79038587807.pdfIn PDF document text
    • http://taiyoaquris.cn/upload/userfiles/files/20210707221632.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611c8758de571---wilip.pdfIn PDF document text
    • https://ckmandarin.com/uploads/xiwemubudikilewuxupowor.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210522223016314.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c998f59da89---3338109516.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/xuxuxutarelogunijagavula.pdfIn PDF document text
    • http://crm333.com/documentos/file/89135509929.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607276833ff62---guwiliziretudopepun.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/76347658909.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/urexikalopixud.pdfIn PDF document text
    • https://hongmao.tw/uploads//files/202108041048461106.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/99049640192.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608573a06d172---xewulerirupile.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/8a5c8fbd0d1b83d4140b0b91df40b6cf/bipuvufaperapaf.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/91083838487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=diffusion+tv+coupe+du+monde+2018+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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 18476 bytes
SHA-256: cd26b216ea81ea7a298142bd83571fa659a920005fe50148179a50487e09c994
font_01_sfnt_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E0 11144 bytes
SHA-256: 63358137340d6eeab4c7dd7aa40103effdbfcab4a7c3fce05eabf93a310605c4

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