Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c347b4f9aa896aa…

MALICIOUS

PDF

80.5 KB Created: 2021-09-04 04:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 32906615d60abec6992f7fb21129e570 SHA-1: 559f1636296b0dd4f3e34a65f1a2470e1ed88c21 SHA-256: 4c347b4f9aa896aaa3e23687450383988be388aaab2601ec3f81eeb33cead56a
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. The primary purpose appears to be SEO manipulation or hosting malicious content via these numerous redirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://geologocarmignani.com/userfiles/files/dapala.pdf In PDF document text
    • http://j-line.ca/fck_upload/file/873628784.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/16/file/rumavubumawavabonixip.pdfIn PDF document text
    • http://odumakus.com/uploads/files/64355823768.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078780048ebb---18229917020.pdfIn PDF document text
    • http://muabannhagiare.net/images/uploads/files/45805953532.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/78070833843.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/ae2a1be1bba31246bf14d2ce725acd95/tazivu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/5baae204b9dc4978df60dd16469c2143/tetirikunalalebuvovif.pdfIn PDF document text
    • http://pasted-radio.de/web/files/jekonisizu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd59d605b9---wavif.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/53193707268.pdfIn PDF document text
    • http://rapet.hu/files/kemumovagirel.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cb80cbd1e---61814172574.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/luzubagetukagamuwexapoz.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/gcf4i5r9oajjm03bk9su8c0860/79975384804.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bac4ad4717e---vopunokususugifo.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/9bd5e6e87c46e1feaa9db948022f3e04/19202121165.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210720113359.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/cuqeqkrenccl7m91v10vuabj2s/jinoxupamilimodi.pdfIn PDF document text
    • http://yuha.be/_files/file/ziwofovizelafozajepakepu.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/16086cf8b27b80---8106695358.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/76752986612.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=real+estate+investment+thesis+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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5A 17404 bytes
SHA-256: 4f9e058e0e2b82dfac31f26abc0287c8cd0b593339fc4e6d390d2917c55e3af0
font_02_sfnt_off00011c45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C45 10656 bytes
SHA-256: 77647a8e772129f641ee6bd4b7faead6a3115ec48b2ecd4f0fd54796d7db500a

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