Malicious PDF — malware analysis report

Static analysis result for SHA-256 41c727bc712b16be…

MALICIOUS

PDF

87.6 KB Created: 2021-07-15 20:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 46eecea4e263135b791f7cb9444b7951 SHA-1: 187fbb129cb8efdc94b97069a091bdcab34facde SHA-256: 41c727bc712b16be58208a5ebba75cff9c1b7f35cd1fa5ef797b7607c4e6b7df
96 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised CMS upload storage, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of multiple distinct hosts and UTM parameters further supports a malicious intent, likely related to SEO spam or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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://lacasedescaraibes.fr/file/mugire.pdf In PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ba832e3a3---6784224729.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d92a06e1379---56853016747.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/6b4e77ab7950a2641e8389e119a4fb74/28603605927.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/batilobekolewufi.pdfIn PDF document text
    • https://hogozaty.com/ckfinder/userfiles/files/wosenivadudotojamerokimu.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/rawerejafefadanodefet.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/dovij.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f4cd8af6dd---sariregogotiwotad.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f0ac4332---84327756899.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-6-23/20210623014545400320.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/1911526884.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bb5f59604ea---tabesawutu.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ee15a772a---55142479236.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/7e64c6501de803946ded8ad6ed5c628f/29557524414.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0e9fe43be117c5f8694b92bd83632881/wivaxalolamezazu.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f15cb557d---nuzerowimagajakunuru.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/mojaboxonorokaxeruxevusoz.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085260bcbe83---65832720763.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/85338840353.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/nataxadivuvawupabi.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160716b4ee9bf4---subujilabuxegose.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef1ede6cbc---15104575717.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+silent+blade+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_off0000f402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF402 17608 bytes
SHA-256: 4c089b0588863e28ca524e61b792698d4f0bac07787d6611f65eec4633d97da8
font_01_sfnt_off000121ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 10476 bytes
SHA-256: b3e5508365a826e5520df59d9bb84984685e8981e4dba47305b5b3f4d5fc78aa
font_02_sfnt_off00013969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13969 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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