Malicious PDF — malware analysis report

Static analysis result for SHA-256 176205b94690cfba…

MALICIOUS

PDF

71.0 KB Created: 2021-10-03 22:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: bd58c86f60c8e8744a53129494e8e2e9 SHA-1: f6957fe4da269cd57f9f1fcca95bacba7051d103 SHA-256: 176205b94690cfba5ce898b864a00c0b3013b9ef5568dd8981387934c62f6895
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://wastran.ru/uplcv?utm_term=how+thin+is+my+hair PDF link annotation
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/5d9957c74963b847230557d4f70a4cb0/69348606423.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1614d9344d85df---xavobiwuzizu.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/65909066316.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/35992278817.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/34172333358.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/damuregaterevo.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/zixamobarotilosejimanaju.pdfIn PDF document text
    • https://garnizone.com/userfiles/file/litudad.pdfIn PDF document text
    • https://irantruck.ir/data/file/28324449023.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/soriz.pdfIn PDF document text
    • https://psicologopsicoterapeutaemdrtorino.it/uploads/file/23551505205.pdfIn PDF document text
    • https://inprovitvenezuela.com/ckfinder/userfiles/files/66273194333.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/29767041613.pdfIn PDF document text
    • http://unsersohn.com/images/file/49549140941.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/dosoge.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/lukoderadop.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/9567838036.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161448e8c54333---97600510052.pdfIn PDF document text
    • http://uk-finansist.ru/userfiles/file/bovemomolaviz.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161526a67c2ff6---disatop.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/limixadajilefuga.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-9-6/20210906074928348119.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/73918336625.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/sirumipunefedavero.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_off0000b314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB314 17480 bytes
SHA-256: 6f50cb0f442a0beb927a658f0f91f9fe4407b804598cc87e625ac1a41171a6d7
font_01_sfnt_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 10388 bytes
SHA-256: 98930cf04440c678cbe23239b295e63233090a4479d4dba3b2846262425a01fc
font_02_sfnt_off0000f6a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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