Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fd15ca6defe3768…

MALICIOUS

PDF

95.2 KB Created: 2021-07-25 18:57:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 564612924852b64d9c0c7ea636318568 SHA-1: 1d3b31c7c70a5d435d19059f315bbfcca5dbfe8f SHA-256: 4fd15ca6defe3768c69f392efb1a603ea6d71c461eb4d91bf43d33f4ccf5fa7c
156 Risk Score

Malware Insights

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

The PDF document contains a link farm directing users to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malware or engaging in phishing activities. The presence of multiple external URIs and compromised upload links suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 https://toskov-yordanov.com/userfiles/file/72446283632.pdf In PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/8727c768d584496c5a0b4861092ee2f8/vimuxaverejoros.pdfIn PDF document text
    • http://fujavietnam.com/images/Download/kuguvifipeki.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/kagamutijegibokibowikirud.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608059af5c721---galem.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/17036776353.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2kef2866759hmcpinikg6um836/kesozijuwaned.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/gimufurogujaratokun.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16093d18016e73---noxofena.pdfIn PDF document text
    • https://mszukam.pl/dat//file/pujobosakafowemezazukefo.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/18184987278.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/tepemobidi.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/25299v6dee5fm9ik6tluh2cg57/27147416288.pdfIn PDF document text
    • http://aps-mes.com/files/file/papetoguwepatepilemax.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/bebivafiziz.pdfIn PDF document text
    • http://ge-mak.com/files/46320543541.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5a023a38f---92222889515.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/49116060089.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/de71fc8d0a4f49e46acedd0bc068b561/51552760077.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/tadijog.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b4e0a66bcfe---dekedol.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607950758cae1---15233666246.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705ebf61a17---gibapejukanukupimivagab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+x+and+y+game+download+for+pc+softonicPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210714/16261999398065.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_off00010ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000124f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F8 17648 bytes
SHA-256: b137c82ef231a8c3c3475917c5160ce9878d315794227fabf66865d66411f0d8
font_02_sfnt_off00015335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15335 11360 bytes
SHA-256: 2ae212e99adc8aaea69c5eae1ffa04364e55e2a5e08c7fca9df39d00fbc669f5

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