Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d92bb89a8e13f29…

MALICIOUS

PDF

80.0 KB Created: 2021-09-09 19:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9a9063a6b2898274b622aec0581195a5 SHA-1: de4ca683b069b1990abf4248c613f4e3298a52c5 SHA-256: 2d92bb89a8e13f29601940eff4f016dcd7955e9ec107104886cac197b25a15cc
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, some hosted on compromised CMS uploads, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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 http://baohanhranghm.com/upload/img/files/lodexisigigetinoxisuw.pdf In PDF document text
    • https://tidaksusah.com/contents/files/80332831912.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/zabenasu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0570b2fb6---kuvemibolojudubikixi.pdfIn PDF document text
    • http://www.medic-pneumolog.ro/fisiere/file/32588298792.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161335445c30c6---vixegepupagoz.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161338252d68a4---nedufugexovesigiferi.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/dozobebalalavujopefa.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/954174815.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/disex.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/jujigekegesobujamozob.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/62272212052.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/91296753453.pdfIn PDF document text
    • https://mashura.co/userfiles/files/83897404622.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/tabegiferul.pdfIn PDF document text
    • http://studiopignotti.it/userfiles/files/lisatipabekuvifabomafifit.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/90982835684.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613992357a48e---98687606556.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/ruxasuf.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16139810dc5e32---54216314179.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/2232366243.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/38324909621.pdfIn PDF document text
    • http://alvitraders.com/files/30731445760.pdfIn PDF document text
    • https://srsatta.com/ckfinder/userfiles/files/bedibotatukagemakanufanal.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/damazagapegul.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161306c82100db---jegiraxotekel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+sync+contacts+from+android+phone+to+iphonePDF 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_off0000d577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8E 11028 bytes
SHA-256: f5818c6637a64df4d153b046b2f0a1d9f15338032abc3698b4ec5b212d6440bd
font_02_sfnt_off00010716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10716 16656 bytes
SHA-256: 48de94e031e4afa7abf9bd0a0bbe736901bf7444376787b3ff29655b07d7bdd2