Malicious PDF — malware analysis report

Static analysis result for SHA-256 38dfd95241976a78…

MALICIOUS

PDF

83.7 KB Created: 2021-06-26 07:38:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 837d2e8f72d3b6d324b971e48d6cc4e2 SHA-1: 265dfeb53fc6a52166b33dfc52b8c91ec0a7a63f SHA-256: 38dfd95241976a781fcd7e4048cc80f1c1cce4229127427590654ae59eff13a2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also includes numerous external links, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content or phishing pages. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16074495c4940e---15081984801.pdf
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/70734506937.pdf
    • http://tamilannuaire.com/var/www/vhosts/vps296430.ovh.net/tamilannuaire.com/images/file/valovi.pdf
    • http://ergo-logo-bamberg.de/userfiles/file/27466741027.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/mheu4egumbnbgg3pl6ohh3uu4r/jerixegewikagudelig.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/tu7olbsev0atv5eq1078i59fof/60372475298.pdf
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/40021315599.pdf
    • https://coluer.ir/documents/file/29155449402.pdf
    • http://rld-carbon.ru/file/xezolitu.pdf
    • http://campfirewtx.org/userfiles/file/1593082902.pdf
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c5521c958---23472650417.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae55da2bcf6---depalozozijoved.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/0acdb43d9fcc39f08b80c01de80610fa/sepinerew.pdf
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/mezotirurigizup.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/ecb0733aeb877899c34225ef1043b9ef/jajaxagedilujifamoniwe.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/8ed4ad56786e0fc302fb438d2b345b22/fumewaxikis.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fada8227b---59730802193.pdf
    • http://ahsaipu.com/v15/Upload/file/202151537228757.pdf
    • http://canxetaianhduc.com/images/file/67962089639.pdf
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/215ec89ab5c947eb9cf4b12eca34dc79/30813865468.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/5bfdf4aa3b6e055e0ccca6022037ace8/zaguxulovigu.pdf
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f37bf8b084---25951558637.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=playing+with+my+baby+quotes
    • 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_off0000e489.bin
89314bd9e20b1696c804077b9fcc2bdab666ebde87fdb6e17a1ed1250fa7fb4c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE489 17112 bytes
font_01_sfnt_off00011059.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11059 16792 bytes
font_02_sfnt_off00012870.bin
6bebae581298b9f1a13cb540980e23af8d551fe015cdb6f4da2c33c0b759b7f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x12870 11040 bytes