Malicious PDF — malware analysis report

Static analysis result for SHA-256 a56f078e732acd52…

MALICIOUS

PDF

91.8 KB Created: 2021-07-29 19:10:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7a51f46a3fc5086c4f5b5cd54d39e9a3 SHA-1: 5daef9f102acbe3ef802bcd7707600697b611c36 SHA-256: a56f078e732acd52b929cd6e61f6e7e2f106423da4905f8d25d7fd1e9e545829
156 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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://agrilaui.com/userfiles/file/63175053753.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b5b2d09c8dd---12412798071.pdf
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/rovugegarutunoxe.pdf
    • https://capitalsyndic.com/userfiles/file/tevilujope.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/nhitkdr0ogga6kjqepbjfl4o2r/pebamod.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba86883158---58433638705.pdf
    • http://centrons.com/uploaded/file/92674628660c364f87c546.pdf
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/d1f167bf018d177d726860cc870d2ea8/juguzidoma.pdf
    • http://studiobaldizzone.com/userfiles/files/sezitavidovewusan.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/6aed31c386e05c49520f70c5f68ad295/pirusutelavizagisajoj.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b9f5bb4f6---xaredonotujubu.pdf
    • http://africa-emergence2019.com/userfiles/file/doxoxinofupamorebonulis.pdf
    • http://hawks79.com/clients/85064/File/mozezagibuvewonot.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0520e131e6---29082323216.pdf
    • https://reklama71.ru/upload_picture/84645867270.pdf
    • http://animalscipublisher.com/files/upfiles/file/zoxibaxajumufileweb.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb429ad596---keralobobovaxolurajozedoj.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4536d70671---ginugatur.pdf
    • https://thinkhigh-tech.com/d/files/6553519006.pdf
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/botifofuxorasefogov.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9639a9b6a---34906320868.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/01818f5597a8521d0830b18d6d3cd422/75518007890.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cdfa45c5b96---57075704539.pdf
    • https://fnb-concepts.com/images/uploads/files/65622409608.pdf
    • http://vasvaripalmuzeum.hu/upload/file/77453584301.pdf
    • http://epoxidice.ro/mm/file/98864672578.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=roblox+be+crushed+by+a+speeding+wall+codes+2020+april
    • 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_off0000ffd5.bin
e9b6dd10e63aa729b4d74b7a55cf54680c7125cd1dd9e250298f800002dc240b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD5 17580 bytes
font_01_sfnt_off00012caa.bin
7024686fab791dd334612ba2552169ec6702e52dab39e2ac946fdc76fdb5981a
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CAA 11524 bytes
font_02_sfnt_off0001479e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1479E 16792 bytes