Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bfc9630e41dc7f7…

MALICIOUS

PDF

116.9 KB Created: 2021-06-29 09:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2939f19faf6b286dad95a41bccd38c6d SHA-1: ff645900e068c2426fec9760a1d82a2ac9ba4e2d SHA-256: 3bfc9630e41dc7f7fc6718d2d84e9f9602a89abe0a05f2912ad9d2b7c6538bb8
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to multiple domains, many of which are hosted on disposable infrastructure or compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The embedded URLs suggest an attempt to redirect the user to a second-stage malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://18554080.com/userfiles/file/20605941608.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b80a803e7---xarojodazesewofupo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a83a8e79ffd---17483109208.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/83153037145.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/pemowajigubakit.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/90403211603.pdfIn PDF document text
    • http://strandedtattoo.net/file/46204416525.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/zabirumujoz.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e4a2ef85---95837858822.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/rnmnc2avgu4k8561o47c197rch/sewewaresipedesibubez.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1b98920cf---20277392464.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/72480157210.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/0378c1e3fb7ec54410e9e4a788d35d2c/vasuzo.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16086169c7f469---51165888252.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79e8eec5c9---63527972482.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b9cf704022528e53f165912ade30aa0d/6433829632.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/67470651775.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/puzisabivok.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882c626040a---kapiromojigumonumalamori.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a342df21---gepalogupelujoxun.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b0962840e9f---faraxoxon.pdfIn PDF document text
    • http://henca.com/files/details/file/47569676478.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c03ba9e998---monotilow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=marge+piercy+woman+on+the+edge+of+time+pdfPDF 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_off00016729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F40 11044 bytes
SHA-256: 5eb54f904b06b23fa4478a48a30bf0ad861bd1787ab72be3ccd6d0f481127ea2
font_02_sfnt_off00019897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19897 16960 bytes
SHA-256: ddebc5b33b381ab6fe2c9686952f2a83c789c815d61b86a72cf33b248eba9aab

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