Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb562489993f62d…

MALICIOUS

PDF

96.7 KB Created: 2021-09-02 15:43:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0594ff0fc5d447be60d9f76771b15fb6 SHA-1: 5567e7e36cb4ad777d1ccf51ed440dd946a80472 SHA-256: 7cb562489993f62dfad6aa8df00ae613c91cf98e10bf6ceb755baf45edae7a2d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing users to numerous external URLs, many of which are hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 6

  • 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.
  • 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://cafemsoffice.com/userfiles/files/resoxitu.pdf In PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/4f751ef5887fce06a68f4804acd8efd6/niwedovef.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160717f27cd616---tezodezef.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/gejakinilaxalipane.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/34282e0331fba0424227a84b16c9195d/pajuvutofuw.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/43565364521.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/78720039427.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/48mf9hjqehf2s9ahrs7a37u7d4/darogure.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/zegapiwilut.pdfIn PDF document text
    • http://sinoorchids.com/image/file/22475927236.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb9fe14b58---xerokafoviso.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/xibuzadivisowixe.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/25213671657.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/15675079330.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/15826732202.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072086c01458---68266982724.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/63893406398.pdfIn PDF document text
    • http://xpressup.com/userfiles/file/25918662888.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/ranowanizirobig.pdfIn PDF document text
    • http://tcmoving4cure.com/clients/a/a2/a295acc0500fd37d831de80ba00a7552/File/dopodasu.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc0a7e7930---35274692821.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7b8287f611---pakekitulogug.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/7vbold8as8d6mi542dis03anq7/tenebujug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=x%C3%B3a+trang+trong+pdf+2010PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B0 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000101c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C3 10676 bytes
SHA-256: 545a552b1201b30e495df0db83f9ff6bf25ec9050fc9308f69069cb623d6512e
font_03_sfnt_off000119f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F1 16284 bytes
SHA-256: d707e3381d1825b7537f622e28c3d5e47799795c638ace14622acd2dafed2c05
font_04_sfnt_off00013019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13019 26520 bytes
SHA-256: 65d5a96cd7311175ea8eb86678166683e730f7e15ab1ac5eca07a2407953c9d7

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