Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d960cd1a97c7bb…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 21:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ad314578e15e28d42f6749ca32492746 SHA-1: 50ea736f179f8f63b467ba6ab9f7f42117f3a53a SHA-256: f4d960cd1a97c7bbf9f3cfd09f78829201eb0168867313ee1bb140bfe9c39922
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms or disposable domains. This structure strongly suggests a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further confirm the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://mamnonkitty.com/webroot/img/posts/files/tumewinixe.pdf In PDF document text
    • http://lamexmarket.com/uploads/files/64149425984.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec1e539d887ee13012a138c3f20bb345/noxojawebogomibogutixinil.pdfIn PDF document text
    • http://camwater.org/media/files/bexokula.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/crm6avb71i2bedlupbkepjoruv/42700168080.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/sulabamalerawamuzuxat.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/97095697320.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/46501963447.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd5bd891e1---2831544443.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062405114173499.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/e5002e40c2e4304584b9fd9c04a2a0c3/xifuwe.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/zadegasobewelajawaved.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c175a84f855---goruserulamuxepunez.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da90792536---11266480783.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/64559304733.pdfIn PDF document text
    • https://frontlinetherapist.com/wp-content/plugins/super-forms/uploads/php/files/7afb5c3cdad384f6c295b64c261fdbc2/79870912701.pdfIn PDF document text
    • https://mindspacepsytherapy.com/upload/ckfinder_temp/files/20210617155325.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/24162721568.pdfIn PDF document text
    • http://moretonassets.net/userfiles/wunilapeliv.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuxepumiwada.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/nijazebirokok.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/5nthsv8pebfnlicle5tc5peh0l/xanudatadevozuja.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/direzoxoxawobeme.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=clint+eastwood+bronco+billyPDF 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_off0000e0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F9 19024 bytes
SHA-256: 752e04897f9fbc51910a6dab38046e406566bee17e447cc5bb6d41ece017f865
font_01_sfnt_off000111ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111ED 10732 bytes
SHA-256: 952c9679bc5316bc8d2a7105b103677e057468c24cb563bec1b5cb7abf212812
font_02_sfnt_off00012acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1