Malicious PDF — malware analysis report

Static analysis result for SHA-256 61276b19ca4ddda7…

MALICIOUS

PDF

69.9 KB Created: 2021-10-03 10:57:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c0f6e360fa28701f8df7ae1490605648 SHA-1: d7516e09f652ead31b11245934abccb6ba870ebe SHA-256: 61276b19ca4ddda7aeb917d89b9ae92f544535617554dad18a9bc518b50c3d84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, designed to lure users to malicious content. The presence of multiple PDF link farm indicators strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cssh.es/img/file/damogaxogumorekolid.pdf In PDF document text
    • http://www.farnostbobrova.cz/ckfinder/files/3866194243.pdfIn PDF document text
    • https://online-wums.com/files/files/90963682985.pdfIn PDF document text
    • http://toroisg.com/public/images/files/12554881017.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/lenidakilifape.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/29666638733.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/bejozegozufu.pdfIn PDF document text
    • https://mimpishio.com/contents/files/gujifugorow.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/5c76b110a1e36c6f79bcfc7e3d4531b9/nupamumuv.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/xenoxulasija.pdfIn PDF document text
    • http://stattus.com/assets/file/mubabaxirakowi.pdfIn PDF document text
    • http://ecolservizinettuno.com/userfiles/files/jaxewovenomozarizirisa.pdfIn PDF document text
    • https://360clothing.indicsys.com/home/www360cl/public_html/uploads/images/files/5154794743.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/49160ee108e284f8581d21713a147d2d/97190046635.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/vobigawaraxetepozoro.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/nuwibofapomibizuvokeg.pdfIn PDF document text
    • https://ksdc.in/userfiles/file/metigalakemezosinexoliben.pdfIn PDF document text
    • https://eetravel.net/file/13966312964.pdfIn PDF document text
    • http://decorstore.eu/upload/file/5966260677.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/a9f554020141172f5636963de1637a37/zokanegifebunaki.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/cbiuujegnf83hvp60a4018cq01/derodemenutitiwanalotuzi.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/tusegizirutakofexar.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d2e53d2e---tavose.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/161382a7406484---foduzujuzipu.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/ponavodiwedujekebunivetat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=new+orleans+frenchPDF 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_off0000b296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB296 15992 bytes
SHA-256: 574b9fd0bc74187e606a85581f71ccc4bbc4b0dba599dd59bc0b91de0caa814c
font_01_sfnt_off0000db5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5B 10308 bytes
SHA-256: f68520a6f8e965e8ed26240f12d29b5a5663fd559fa60932af3e8ed1de80b229
font_02_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1