Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fee22aff3eb07f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 08:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7f19ccbd50c702df2a69869e551ec9e1 SHA-1: fb5e7895f8658b6c98173325d85edc926002e5f2 SHA-256: 71fee22aff3eb07f1e571a5bb6f9ff74a136204ecb206920b31462a8b2b87e61
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL findings strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://kcpsystem.com/userData/board/file/90883481192.pdf In PDF document text
    • http://1-cities.com/blog_images/blog_/file/93762656369.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/64022369625.pdfIn PDF document text
    • http://manpukuorder.com/uploads/files/kijolokaxofotewupamutezi.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/xaloxewarobozuluwawizubot.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e6e3e360c---zufilukefasixu.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/kowubutakinu.pdfIn PDF document text
    • https://markaoyun.com/calisma2/files/uploads/37577111387.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/12872084927.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/bovamirigur.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/82621185956.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/23858698862.pdfIn PDF document text
    • http://leeandrewdavison.com/download/84559135749.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/xinulizefe.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/5161285533.pdfIn PDF document text
    • http://iltorg.ru/upload/file/57995160229.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/f602be8a2142c332e2b2af1e7f0f25cd/zodonewanurotinok.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/jisok.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/lironafanatojelazor.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/netubumalokubigigopab.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210911055004.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614258fc96022---pazate.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/pikegumajerodap.pdfIn PDF document text
    • http://thsport.dk/ckfinder/userfiles/files/82074577806.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/gupabilagisuto.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/49180566475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=iphone+in+android+installPDF 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_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AF 17920 bytes
SHA-256: 35a420b68fc949c057d902b16e0fa50a8044d6f3c365fc47a472d26804e60dfb
font_02_sfnt_off00012271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12271 10440 bytes
SHA-256: a9a1cf0d6a2fbcf9000e33bbce7be51113fc6ff894f76c059664169d8711ab34

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