Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc772ab2c500396b…

MALICIOUS

PDF

84.8 KB Created: 2021-06-28 13:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86db0b3174873309787e8304f6577124 SHA-1: 63f07f8d67e86f32ee59a9b881592b13b88affe5 SHA-256: dc772ab2c500396bba63a94fceacaa1ed76a8fc45e05472e1acf1834982b7986
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 to redirect users to phishing or malware hosting sites. The embedded JavaScript is likely used to facilitate these redirects or further obfuscate the malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://smidgel.ru/uplcv?utm_term=anaerobic+energy+system+definition
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/bbf723912f7aa5bf3ee9b9a8ecdc77c4/78814807137.pdf
    • https://egokituz.org/files/galeria/files/nuwonovo.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b48cb7012f4---42294878324.pdf
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/0aeb4d7096d5ff7d71acd0f454093f0b/jasikimubuxo.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/14j12qud71cu0325lufec2q3g9/ditukeribo.pdf
    • https://iwanbim.com/userfiles/files/goxirimenozebitunodu.pdf
    • http://www.celso.org/download/muzenusature.pdf
    • http://atdawnwelift.com/userfiles/file/goxanutas.pdf
    • https://alakharia.com/public_html/userfiles/file/zezenozixodumabaxatawifom.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/g5iinb9el3j6uq00no2q9n68i3/72205024094.pdf
    • http://aqbnb.com/uploadfile/file/xixasisarunamejodejusomez.pdf
    • http://roxburyhs1987.com/clients/63080/File/5249646056.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/8b9f327ff49056ea68affd5ae16e4c5a/52244196961.pdf
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/648fbbbafc6d622e8d2ef81fa9fb1952/tifosizupomu.pdf
    • http://granite1962.com/clients/869125/File/51431079133.pdf
    • https://burgas-remonti.com/userfiles/file/45509600693.pdf
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/51d98c68a2f8908148dbda9f1a55e462/manilaxosudutowewetuziwo.pdf
    • http://canadanur.com/resimler/files/suzuxodezexisisojeze.pdf
    • https://konferencii.ru/js/ckfinder/userfiles/files/zogekomuzejozipogos.pdf
    • http://stroi-sistema.ru/img/nupugazo.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed2ead8bff---buvedinawugaxituxozexo.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_off0000e83c.bin
4575e169a05445da894506dd2e9ac38e6c4ca16c9e868167b292ba34a9d27394
pdf-font-stream PDF embedded font (sfnt) at offset 0xE83C 11008 bytes
font_01_sfnt_off000101b4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B4 16792 bytes
font_02_sfnt_off000119c6.bin
d1e77a6ba86ae5c9aff600aacffd0e1e5c630a833c04e1af7922d3ffdac076b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C6 17120 bytes