Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfa30e4648c3d81…

MALICIOUS

PDF

82.2 KB Created: 2021-09-21 02:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f517af3355e2c982d63e5b2201a392a5 SHA-1: d1f20347bb195755c61e387776e2879986978933 SHA-256: bcfa30e4648c3d81d3db5465ebb55a0e1d671b098f8aaa060080dba3c5ed8132
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or are part of a link farm, suggesting a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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 https://krisoc.ru/uplcv?utm_term=among+us+mod+menu+2021+mobile PDF link annotation
    • http://gmtshipping.com/attachment/file/24788407573.pdfIn PDF document text
    • http://kartinatv.org/uploads/files/93588020507.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/99486761343.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/80888060071.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161322f62ce61f---towobuwulirawojabavox.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/161410e9d8d33b---tonitagifofiwisil.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/88647544689.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/65104563618.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613878c60ed27---rujazu.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/gipuromuforitalezasa.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/kuvojogamig.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/40686621722.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/24347468318.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/filozuvidol.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///49769410309.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/17001029304.pdfIn PDF document text
    • https://profesa.net/userFilesfile/16791588903.pdfIn PDF document text
    • https://www.sacict.or.th/ckfinder/userfiles/files/wovoparenigime.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c23f1774---56868857129.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/18930986307.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/donarasefamu.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/59919874325.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/96933588213.pdfIn PDF document text
    • 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_off0000d415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD415 10744 bytes
SHA-256: 3c0eaf72c00b083e57e973c474acd73ad686aa48fcfbfa6624a197677c5fc18f
font_01_sfnt_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B0 20332 bytes
SHA-256: 827f69cbd067e7df8426f1f382b9555d97bbd445ded3d7bab97511fc4339e20c

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