Malicious PDF — malware analysis report

Static analysis result for SHA-256 b59a2cacef37276c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-19 04:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2b6abf4c591b8c7b1d9e627a45a25ecf SHA-1: e96f7ef8739d8e0369788b84dcdb9d9876a25c3a SHA-256: b59a2cacef37276c2d236fca45eac7ec62562d7ce5cc992281b9b01bad73e5e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external links, some of which point to compromised WordPress upload storage and disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM indicate a pattern of using link farms on potentially malicious or compromised sites. The embedded JavaScript, combined with the link farm, suggests an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://vesimport.ru/userfiles/file/dugikozaxutosuwumunub.pdf In PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lewavejubipibopodoro.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/59054700390.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/mijuzitobezedo.pdfIn PDF document text
    • http://redactron.com/userfiles/file/vadunasanagovodigum.pdfIn PDF document text
    • http://solartgaleria.hu/images/file/31587586217.pdfIn PDF document text
    • http://www.gyndoktors.de/ckfinder/userfiles/files/dorijumukijerawijute.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/bowatexeli.pdfIn PDF document text
    • https://officialbacknumber.org/editor_up/natowuruxi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa70418ac7---dufikunelagusofofexirodi.pdfIn PDF document text
    • http://revize-elektro.info/UserFiles/File/soriwu.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/tapomixeneduluru.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/vipivakomemumijoxuvem.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614678637a7c5---31736778403.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/89077118159.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/66599602083.pdfIn PDF document text
    • http://client.diffuse.info/files/3180917772.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/44471774519.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613962679f086---81473025872.pdfIn PDF document text
    • http://dalaichau.com/files/zisijidesa.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/14940820493.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/33727729585.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/87342439758.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=aptis+vocabulary+list+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_off0000d0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 17208 bytes
SHA-256: d28f87781fe54cc3dd3b14ac977a1b6c03d4c6cfbba4bf7b7d4a05baa24deb6d
font_01_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 10780 bytes
SHA-256: 25b6e51b784f9470b95e4137e26fae992b1be210f5856263a46664a031da0c73
font_02_sfnt_off000115f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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