Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba3ceeab24a6c0b…

MALICIOUS

PDF

82.9 KB Created: 2021-08-31 11:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 80e85d1e55d73c4f904c83dfe3b87279 SHA-1: a96be7f0eea47ac04b057ba4e0e384c87bbfe68d SHA-256: 5ba3ceeab24a6c0b36f882c7513e19d09ce7a9dfe1662affbc95831e6a79eb4e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://firegallery.ru/img/upload/kojipigadetavazozozebo.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607987163b597---wogodonawelefikuf.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/bifilolonawox.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/bazevifewasatirexozuwas.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/zimojipomitipa.pdfIn PDF document text
    • https://lanjutpt1.com/contents//files/depemadukid.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/37566191290.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612c3ce439afb---72816878716.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/risunep.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/tasedagule.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/33898141166.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/ditulofewofurex.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/49705743637.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/91465825447.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/wofolalupekigariromoke.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/zejovabenotasegemajukan.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ef36a84edbca9321982b031928bd357d/4569119778.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b564340493e---19239634744.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/wuwigumud.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef4931816---38791337645.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/jizovodokedukupusowasij.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/tojitofedabel.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/zupugafebasujowefunemuwal.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/39465037880.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2231c9bbc---1284875228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=old+gas+in+snowblowerPDF 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_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DB 10576 bytes
SHA-256: c13df56f1382d0f70dce6a744c52bc3ea9f59ee31cf5ab3bec359fdc9d758173
font_02_sfnt_off000111ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111EA 17048 bytes
SHA-256: bd00df6a6023cf116c126c98e5fc25994e52ae629cc34d0fc01c8d86522d7b81

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