Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ec829a9c9ccc3f…

MALICIOUS

PDF

88.1 KB Created: 2021-09-23 19:54:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 97a5915d15bc7a60afeaa39850d13f61 SHA-1: c964ef80b03edfe4549ef39c460ecc0d43be506c SHA-256: f0ec829a9c9ccc3fa812bb662239f90a2c40cadd4d68b0d99622bb4c63933fbe
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. The presence of numerous links, including those on compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=how+to+close+an+app+on+android+phone PDF link annotation
    • http://gzhangqin.com/uploadfile/files/92392337849.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613577cb7ea49---53208014486.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/pojisar.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a600655c15a5a5955a7972185a583afb/47361738640.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/99462667893.pdfIn PDF document text
    • http://vhktn.at/images/content/files/71939836890.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/38485670608.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109020745149174.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-14/20210914145847665953.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/avc9oi8lc5l5v08h1irp8qo2l4/98925899784.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3155ebbfa44d3c3ed6336e7a1661c031/54720880429.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/samabinejebuvaneru.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/522f21449ce2174dc59ade1fd5c0c9fd/bizemodulo.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/1614b7c2208ec9---14850286466.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/75637185774.pdfIn PDF document text
    • http://komodovo.ru/upload_picture/piduzuvafowibarugubolelut.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/vezapomogas.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/31971312277.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/23373460696.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210903_075224.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/28870800858.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/muxavuwar.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/96201939507.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1614b81601c71f---98943528228.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_off0000f2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 18068 bytes
SHA-256: 8073d06da7d2658101fb348e235d2e208ed3c91377fef880429b9fb925bae560
font_02_sfnt_off000139ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139ED 10688 bytes
SHA-256: 5b94177c72d0b1a23ad89fd85b05cf21ad8d8087a7a41a4b9b7648f84867db3c

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