Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d0dcc6626154259…

MALICIOUS

PDF

76.8 KB Created: 2021-09-01 21:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 471ed763a148fbb9a6cc5c70980e0b2a SHA-1: 549efdf8fbba1a041bf6a59e63e3f1f87ac4d240 SHA-256: 6d0dcc6626154259864cf9259c9da79dce75a447183d1322c99cc02b691c8b55
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature, indicating a phishing or trojan payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/nuc8be7qruusftit448or3fpm6/roderalipojonik.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/o8e0m8n89hab81f4482upl2re1/fupogujovuxusufovonasow.pdf
    • http://flightshop.jp/images/blog/file/magapavalep.pdf
    • http://architetturaurbanistica.it/userfiles/files/62275791953.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/qcnqfjbf165hk8o2igths0dkf5/21923041498.pdf
    • http://kaizousha.com/js/upload/files/58093941719.pdf
    • http://americasbestmanassas.com/uploads/files/xasulisatakufabej.pdf
    • http://es-manzokudou.com/yamituki-n/uploads/files/91386006488.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f1c5d9719---55159431747.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/u2b1oc2io568vv3m2ftfaepj7a/xoxudevubotukimorotesimis.pdf
    • http://seja.lv/assets/ckfinder/core/connector/php/uploads/files/juzuxamexitu.pdf
    • http://statsale.com/data/upload/ck/files/wudogulu.pdf
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078233193f73---48138882802.pdf
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/69889825714.pdf
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4565e41ca1f18b86da056f09c7711aeb/returu.pdf
    • https://cafesca.info/ckfinder/userfiles/files/16080843287.pdf
    • https://rajaketiga.com/contents//files/sezixifuvuvutimogekikufe.pdf
    • https://lacaune.hu/userfiles/file/subatisunofurarojuxub.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb8a491679---salaxizit.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaeb671c25---76564490592.pdf
    • https://aymfly.com/aym_image/files/73577360540.pdf
    • http://animationcoach.com/userfiles/file/sifegof.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6993543c4---97631595994.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=bank+management+koch+7th+edition+solutions+manual
    • 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_off0000c83a.bin
eb92a5f97de61c96254860e5979b9ca51822b57151ca85770473fac4f46b8a30
pdf-font-stream PDF embedded font (sfnt) at offset 0xC83A 16808 bytes
font_01_sfnt_off0000f377.bin
0c913986743c62dfb3f934906dfa0ecfff8c5ca53aa0c6de6bf016a74cb06bd8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 11012 bytes
font_02_sfnt_off00010cbf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBF 16792 bytes