Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb694e06de1f4f8…

MALICIOUS

PDF

73.3 KB Created: 2021-09-14 13:19:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f7a615605f7a9b129963512def6c5f8e SHA-1: 97e049b304d41d64cb8c2580c5a1fcb231223725 SHA-256: bcb694e06de1f4f84d3cc59da2b6421d925082624182b58c6c1c744033f3a1ec
156 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous heuristics indicate the PDF is a link farm, directing users to various external websites, many of which are hosted on compromised or disposable domains. The presence of multiple external URIs and link farm indicators strongly suggests an intent to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://laborke.ru/uplcv?utm_term=could+would+should+exercises+pdf PDF link annotation
    • http://fxlcd.com/upload/file/192070095.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/nezipok.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/gikemibozimojulapar.pdfIn PDF document text
    • http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/xegare.pdfIn PDF document text
    • https://mihalex.by/files/files/fijofufolakakilegeluf.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/mugod.pdfIn PDF document text
    • http://upsshop.ru/ckfinder/userfiles/files/difudod.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/dawizopodezajad.pdfIn PDF document text
    • https://najlepsze-w-polsce.pl/uploads/85593934328.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/31724247495.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613252b39dffa---faxurofumizupenetevunaxo.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/wemetakopizol.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/2beadcc703d1778c7117bd646c2686a3/bupodaxu.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/nuboxasamolovisif.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161374a4c6aefe---60224591185.pdfIn PDF document text
    • http://sb-78.ru/files/file/tozipilowezegawe.pdfIn PDF document text
    • https://zlato-stribro-investice.com/upload/files/40710578047.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/d5a0n3e49vkto5buo1hpp3sljo/sigebofunisorebeki.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/1092ffbb0221dfda454f63f2508d2968/59161931360.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/48630923047.pdfIn PDF document text
    • http://chicopharm.com/upload/files/doluzamiwinadeda.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/26788741579.pdfIn PDF document text
    • https://sevenhillsgroup.net/ckfinder/userfiles/files/56109282280.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCF9 16172 bytes
SHA-256: 5951f8f56062a34a0a86fb483a85adad4fd0aad8901e931bf18cc9a48b415041
font_01_sfnt_off0000e6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 10672 bytes
SHA-256: dc1a4bde571257bbf6d7ab032497b7714155c213e2eaf54200022fdfa58a49f0

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