Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b2fd8da483158e7…

MALICIOUS

PDF

72.8 KB Created: 2021-10-01 00:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1b4bdaaaa2a7ba6dafe19d5f1ea7a56 SHA-1: 0a6c501be3cf4bee9e650b88a2e1a67626e5c899 SHA-256: 8b2fd8da483158e7dd8429b60ec9b8cc8cb4a9c45ebc3b6d718aebb31c4f459d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://tsg-edinstvo.ru/userfiles/file/bagixoxawesirufefim.pdf In PDF document text
    • http://mariondhuique-mayer.com/data/file/rebavov.pdfIn PDF document text
    • http://sangsangins.com/upload/upload/file/44839905190.pdfIn PDF document text
    • http://www.puhito.hu/uploads/2592454052.pdfIn PDF document text
    • http://hastensandbreakfast.nl/userfiles/file/lijanelofiwokusupivurubi.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/mopaxojamimedasapopafoxeg.pdfIn PDF document text
    • https://masteranalog.com/userfiles/file/52060726712.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/ziwixanomakorurerop.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/zobewar.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/69494831300.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/92699498699.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/pofubep.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/54077463425.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/xakovem.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613496e1c54ef---lezuxosujunenamijevumu.pdfIn PDF document text
    • http://pensionpoint.cz/userfiles/files/16532811294.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/vovake.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/fotofawaxutinaxivux.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/dedusafazagamaw.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/3841310975.pdfIn PDF document text
    • http://recviem.ru/img/upload/xuxazifo.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614cbb4e265d0---60132304221.pdfIn PDF document text
    • https://etimes.mn/uploads/files/26990352974.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/v63mk0cqsnhe6931c4e4rks8ln/43514049761.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d5a535c01---dipebigixixerenoxusekoji.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/33772014322.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=ielts+vocabulary+list+for+writing+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_off0000b57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD94 11252 bytes
SHA-256: d3dea95c0e6938fbacaee319ec1c0685dc6858d0f36d1e8f7f6efd520ced2a09
font_02_sfnt_off0000e7c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C7 17692 bytes
SHA-256: a4b0bdbd7550a2fc508bcee9547ffc0c0185593f8e3b55bb919f18f4d274f8ed

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