Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa1de91d2886986…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 22:00:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d43ff6c55fa1075e954c7e24a17bbe90 SHA-1: 8cb30327a470c0969857e27975b3826e4e4fa8f8 SHA-256: 4fa1de91d2886986bffec0ac3804f3ec3d795177649e9680a415df0377aa7411
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which are hosted on compromised WordPress sites or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=fast+%26+furious+9+torrent+download
    • http://lube-stc.com/ckfinder/userfiles/files/kirafuno.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/pljg1toj9evinvfaqocgodfrov/lixirebesemizok.pdf
    • http://choinka4x4.org/cms/files/file/bepuv.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/84944857909.pdf
    • http://accapierre.it/userfiles/files/wejegegavelaruna.pdf
    • http://aarogyamedico.com/userfiles/file/69863018795.pdf
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc6d963336---43904422128.pdf
    • https://tyko.pl/userfiles/file/4941845842.pdf
    • http://zabradli-znerezu.cz/userfiles/file/78450439654.pdf
    • http://isotech.si/uporabnik/file/9808059073.pdf
    • http://thaymanhinhlaptop.com/userfiles/file/86118695152.pdf
    • http://www.patriarca-batiment.com/ressource/site-image/files/56410858806.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/82160619112.pdf
    • http://hanahana.vn/media/ftp/file/fuwuvipe.pdf
    • https://store-connector.com/_upload_bilder/_filemanager/file/guganu.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c26c3105fd---63654126844.pdf
    • https://angkalaris.com/contents/files/jerukazubawijadaluf.pdf
    • http://hawaiisushi.iorderfoods.com/uploads/files/pavimapobawosefivawikili.pdf
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/letokadatumufanivemavip.pdf
    • http://nguyenthaotech.com/upload/files/48735213706.pdf
    • http://studiolegalezullo.eu/userfiles/files/30298813598.pdf
    • http://mlsy.cz/images/file/files/woxalate.pdf
    • http://mobilenmr.com/files/files/69127642988.pdf
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/5283681406.pdf
    • https://rajakeempat.com/contents/files/42986593467.pdf
    • https://aglogistics-bo.net/userfiles/file/ginilupozusuzafibuvosin.pdf
    • 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_off0000b5e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E6 16792 bytes
font_01_sfnt_off0000cdf8.bin
05fccc7dfeefe88c55703d284d0f5befd39a520947a64cf185536ecbcef10be0
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF8 16568 bytes
font_02_sfnt_off0000f811.bin
f51d5d1ed6f87b52d1b9f429dd51402bf3eddb0f0727a485d5a13d2cfa109c79
pdf-font-stream PDF embedded font (sfnt) at offset 0xF811 9476 bytes