Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc21eaccebf67226…

MALICIOUS

PDF

103.2 KB Created: 2021-07-04 17:15:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce71343fde6464034794402d42e0541e SHA-1: 8162a793679d22c0784115b9cc9bade8d5c1a450 SHA-256: bc21eaccebf672260cb194596fbc3f7d72286ef7744bb9e643c6f74c8e814b51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8985a0aa5---12236776335.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071d5e2506b5---25885683237.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/ukfcqqkvr2qrjud4lpf1huapq0/4378933775.pdf
    • http://tsutae-f.com/js/upload/files/gogibenalumikumor.pdf
    • http://beachfirebrands.com/userfiles/file/jiwegiboz.pdf
    • https://cavalier-hundezucht.ch/userfiles/file/32950929726.pdf
    • http://efuturesthai.com/uploads/file/dorugolineripo.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2a68e8fcca---65080704470.pdf
    • https://addsfly.com/userfiles/file/bisujuwitojalasemabo.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/81444916035.pdf
    • https://tasleemdubai.com/userfiles/files/moperijibowugezebebugebaw.pdf
    • http://dragonspond.com/uploads/files/gikafotivararuwalatoro.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aea5ac477cc---96204248983.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/h0m7i1o34ch5acn23rhfgjrsat/vevidenarafajedefujo.pdf
    • https://corpusbg.com/files/fck/file/93226480119.pdf
    • https://uleiuri.ro/userfiles/file/9551998409.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d63c40b4a5e---tesopejis.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3663acc700---61214390944.pdf
    • http://hocikto.info/userfiles/file/rovupigibobaditula.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a0936646---53933248201.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d54ce74964c---xanava.pdf
    • https://serwisnawigacji.pl/userfiles/file/43246436252.pdf
    • http://dok-vo.ru/userfiles/file/lajolewiwakugawolozevos.pdf
    • http://denki-shonan.com/uploadsfile/metux.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=acrobat+meaning+in+tamil
    • 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_off00013491.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13491 16792 bytes
font_01_sfnt_off00014ca8.bin
f6963d55ff932cb0c781d093a8fbbfcdfbb2dfd6798f55c4f6441889fb0dfbeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x14CA8 10524 bytes
font_02_sfnt_off00016499.bin
7cd393bb54d7d7fb436be8b1f54739f8451b2c5c107da4ec177bcea868f02d3b
pdf-font-stream PDF embedded font (sfnt) at offset 0x16499 16168 bytes