Malicious PDF — malware analysis report

Static analysis result for SHA-256 49cd03ad4dd11eb3…

MALICIOUS

PDF

82.9 KB Created: 2021-08-22 07:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0be97a4e17249ee76d32dd828e9113ee SHA-1: b28b0c3f23704808acd01e444ceb413457c096f3 SHA-256: 49cd03ad4dd11eb357ba1e36767adeac18ff54369687e117ec3fcde094928340
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or SEO manipulation. The presence of multiple external URI heuristics further supports the nature of this file as a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://yasaitogo.com/uploads/files/kujidesifudidixuno.pdf
    • http://phaptangpgvn.net/app/webroot/upload/files/jidokaluzipeje.pdf
    • http://campbellelectronics.com/uploads/pelivosubupidimubuw.pdf
    • http://phillipsbricksalumni.com/clients/56168/File/43128382936.pdf
    • https://al-wesam.com/userfiles/files/wazujobebodogorutebiboren.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/vuvul.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f9fa8a8c6---59924832468.pdf
    • https://aedwea.com/upload/foto/vafukoporebefuduwunadobod.pdf
    • https://brakos.it/file/duxodefirulabesobifes.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/2r8gml5q4g5ms6h7j3ic309gn3/53150466847.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16118c31acead9---lasimunav.pdf
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/4t7sjivd6bnt6q7jaa1c252q12/95644290358.pdf
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160882ac49ede8---mesetukumifa.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2fe8b9428f---51305691798.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/d1d586b6ddfe3153236ca836e2ea3ee9/polabeboperaxevegerix.pdf
    • https://henklinders.nl/henklinders/upload/files/tikuxotavin.pdf
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da6943b04d---11430139761.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/2aea560414cb74dc4156f724c6193d1f/20143145994.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6cc7a285f---76357261882.pdf
    • https://viratrip.com/basefile/travelasreviracom/files/tabigegizivamumizolex.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/rbobf538d9aiu6tblqqpi2ut9a/bofupezuwo.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/5c9079d17592999fe3ca4166687b791b/beniwijaguxoji.pdf
    • https://themasterne
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+fake+gps+pokemon+go+2020+android
    • 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_off0000dfcf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 16792 bytes
font_01_sfnt_off0000f7e1.bin
231de4aac91641e71e09fc937eaa212b4b1c4d340e025553cc98e354bb86dee8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E1 16836 bytes
font_02_sfnt_off0001238e.bin
e364d45a71f00efc90860cc5420a2a784bcd513e8711430bed986f7333a0c7e0
pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 11208 bytes