Malicious PDF — malware analysis report

Static analysis result for SHA-256 7818ec194d1394f0…

MALICIOUS

PDF

102.8 KB Created: 2021-06-29 07:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7bf67baa3dc9f75515a8976edebde3df SHA-1: cabc2b7b4e3935f2f75c6a55f0fa16c9c7f4b2b2 SHA-256: 7818ec194d1394f0113700508e7fba66e7b3af3f7a4eb85579567e370e8ab1a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The presence of multiple links to potentially compromised domains suggests a broad distribution or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://rainbowfurnitures.com/files/files/64255202319.pdf
    • http://etcad.net/np/upfile/file/50235977646.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/37904401339.pdf
    • http://hopkinshigh1988.com/clients/75739/File/75731346995.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6c669e6fa69dc5b385a3db2eb3c1115f/xotomomiwilabi.pdf
    • http://cmtsport.com/pliki/surowuwiti.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c4010a968bc---miwovamefibuvox.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/63187022042.pdf
    • http://ingmontagna.com/userfiles/files/59157027211.pdf
    • http://safeabortionnepal.com/userfiles/file/11703354937.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/f9d7ba802dfb859eff5d9e67e8bc8527/zadejupotokifalaz.pdf
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/51590475260c345d677ed7.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/132cbe07bc49cefb82f279bedfa21ef9/90291193015.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/233a7add0d3efc257fdb768a30f90d31/43560450915.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb363753b17---vudukujim.pdf
    • http://etabetasurvey.com/userfiles/files/29896434272.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606f985d9976b---tanabe.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a8efcc5d4---8266282159.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/atv7uiajun1d2hg29rurp993jf/magodipasujudo.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7e4fbe01107c34e5087dd1b4a41c5b36/76081737482.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd0a0dd9be1---50592506929.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160900f5632109---36818597320.pdf
    • https://braintreeclinics.com/app/webroot/img/files/23507984917.pdf
    • http://unnatiwelfareorganization.com/ckfinder/userfiles/files/lipulubupuxewizobad.pdf
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607821dccfdb1---pekojudoziw.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=crawled+meaning+in+kannada
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001292a.bin
a94b5759876603be166a071fd7b284b20ea26e0da8297c6a041a1af65c1e10ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x1292A 20368 bytes
font_01_sfnt_off00015eae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAE 16792 bytes
font_02_sfnt_off000176c5.bin
c214566837c8af908626241beb207aad27fddb3db71912d350d8a52b405d3207
pdf-font-stream PDF embedded font (sfnt) at offset 0x176C5 10416 bytes