Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27ca207eb35dab1…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 23:44:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 621b24c0730c3f93dcc74d368714e2fe SHA-1: a60063e9791a6d179cad4be507b80efe565e0756 SHA-256: c27ca207eb35dab154489f1e7501f4f64a0bc751d49cd7d29c1bc63a2d31d23d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many distinct hosts and URLs, suggesting an attempt to direct users to potentially malicious content. The presence of external URIs and a compromised CMS upload link further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/zigarosawalet.pdf In PDF document text
    • https://accounting789.com/ThImg/file/viziwob.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142006a06f24---xudakazonubof.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/96322856441.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/38497968644.pdfIn PDF document text
    • http://imoroz.by/upload/file/xulutex.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/75903560867.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/9602932332.pdfIn PDF document text
    • http://bycongroup.com/UserFiles/file/xagom.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/67399844540.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/59709256552.pdfIn PDF document text
    • http://lnianemarzenie.pl/userfiles/file/63478233321.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/96700526286.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/99776051016.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/57602986147.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/90799723707.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/57c5e2a967e4afe625370eafd2c48deb/bemegolovemumanolafiwojer.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/34985032099.pdfIn PDF document text
    • http://merwepizza.com/upload/file/96650313881.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2845bd2cf2be477589599211ed5ce94a/87309258178.pdfIn PDF document text
    • https://baoholaodong24.baohohoanglong.com/userfiles/file/kevuz.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/28594084054.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/febawemilalarawov.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/65075251008.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ak2tk4644na95apbk7rh8u1gca/83194864366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+get+a+live+wallpaper+on+iphone+6sPDF 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_off0000df0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 10844 bytes
SHA-256: a87c2a7766bc14d57db855d96ab3b9cbb0c7fb2a76812701cd266071c0c78f6f
font_02_sfnt_off00011029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11029 17324 bytes
SHA-256: 6eb0ac453812f64881c4db1b6615115a06172387a6f997f0bdd472527e5149de

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