Malicious PDF — malware analysis report

Static analysis result for SHA-256 45137e0342fec73c…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 06:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8d2b5e0505a5c71cba1bb35234312378 SHA-1: 9acc6ac157f5f448a5cf3398593ae2747189edf6 SHA-256: 45137e0342fec73c8e1348d1b410618de3de6451c8074b317d2119c9fdd9d196
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The document contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting an attempt to distribute phishing content or malware. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://tekizolasyon.com/ckfinder/userfiles/files/zifegevefefezexelamepi.pdf In PDF document text
    • http://alpha-cp.com/userfiles/file/puxejar.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/wusizonunagozas.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/51838194189.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/2okfggnqg9dp0g19qo9nie498s/fidinagiwimobinikogi.pdfIn PDF document text
    • https://rireenfrance.com/images/upload/files/demegarazepakifuwopavek.pdfIn PDF document text
    • http://186086.com/upload/files/69555922332.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/pevupomo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3453bde9e---93450603007.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc024e07b2---19139086601.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/70958412733.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/91451153112.pdfIn PDF document text
    • http://vhshf.de/File/xikinitorutomodojamej.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/42sa6qrjpjejh56cqt0ioohhuk/80172928560.pdfIn PDF document text
    • http://sankofalectureseries.com/clients/a/ae/ae3037074ff26ae8502dacd236f4ced8/File/junalivewasejepiravidu.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/pafoxanosememabowobaj.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/dagobupebuk.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1630070412520745509.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/5f92f5c11e3f869a8a631c655d852f5d/xuvaboj.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/96057387378.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/88440255123.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9db536209f07d04bce961b60a8d990ad/2796658633.pdfIn PDF document text
    • https://tonitomov.com/picture/file/73076663680.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/jagabijakuzovedi.pdfIn PDF document text
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/bs4q9lkag98ppbe25shchnpumj/petozufurugodakakexu.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/kegozenerumadufexaranap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=deep+ecology+in+philosophyPDF 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_off0000e818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE818 18604 bytes
SHA-256: 6407f23c5bbf129115329c7c2987815d4c8a82deafe48cea591acb0ebc70083e
font_01_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 10408 bytes
SHA-256: 3389bbb34eeb16c5b10f8593eaccfef33b6819cf0f025ef96d5013d8d6f36424
font_02_sfnt_off00012f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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