Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6847ff3ea47ab20…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 21:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4c760df51cedf7c15c94742ceb940e0e SHA-1: 0222ed72491b54a9b37b3d3604a1be8e436696b2 SHA-256: b6847ff3ea47ab20f5568519c5ba9a668a57e342e37d06b599b7b5dd0f2db538
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious sites. The heuristics indicate it functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. ClamAV also detected it as a phishing trojan, supporting the assessment of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://honyi.tw/ckfinder/userfiles/file/fedatebuzow.pdf In PDF document text
    • http://relaxzenter.com/uploads/files/17196592450.pdfIn PDF document text
    • https://retta-bg.com/userfiles/20059651946.pdfIn PDF document text
    • https://heritran.vn/uploads/news_file/rafamomataguxigevoraba.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/12465525109.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/49846089367.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161343d9841540---68562692584.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/14485217667.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090621240754.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/jixavozimo.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/gosovato.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/26561808725.pdfIn PDF document text
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/zojali.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab1fdee18c---mukam.pdfIn PDF document text
    • https://jerseyshorepirates.com/userfiles/files/18326212991.pdfIn PDF document text
    • http://ccadl.com/files/20210913181806.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/digopavejerobiwib.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210904235219.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/koxazirujat.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/ruliruwikepur.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/772211acd2a03d99cc1bc7b6ecb14997/givogov.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/31222500479.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/75940696364.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/73509328183.pdfIn PDF document text
    • http://lapmaymn.samdigroup.vn/app/webroot/upload/files/dureg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=pes+manager+2020+apkPDF 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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 10576 bytes
SHA-256: 4827326790a1b1889f4dba59400fdc089ac1735b4c29589957cd0afb365cf204
font_02_sfnt_off00010cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 18104 bytes
SHA-256: cd36a944648f48a616105089a877d1befc303f4f748faf60d3c2101f4c9b7255