Malicious PDF — malware analysis report

Static analysis result for SHA-256 76662c7494ee6467…

MALICIOUS

PDF

114.6 KB Created: 2021-06-29 13:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e483d91a6cfdb05715e4944d35b33f5 SHA-1: e24869ea689fdf319eeb986dd00d8d3be267f4a9 SHA-256: 76662c7494ee6467cdcfb849fda2c94073eb4e2ed590e7b8fb24a5490eb056c0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely serving as a distribution point for phishing or malware. The presence of a 'download button' lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 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.
  • 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 https://cructi.ru/uplcv?utm_term=client+interview+questions+and+answers PDF link annotation
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/751688994a9d3a2623941c33bd52b0f5/28990785954.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/f99d66f870c70f17c3f15fcd907999bd/98784007524.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/619743d723934dc8dfea0fb7af87b84b/62987527978.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7532379c81---20529859776.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-24/20210524000006949886.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e70955828ac03ce5e4f88760aa427bcf/vuzukefejelepomapa.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608210298c415---lixetaki.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2635a24e47---porowinudidukagazaki.pdfIn PDF document text
    • https://noddy.nu/images/file/65990702636.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0ea0a44d5---vosevinepovamuguludovof.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/508b785146a07e6ba8be7b62a5eb29b2/nemakuxiwokotonal.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/d9dc24899a844c798d44a84dc7f4b988/vobovukurotu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a57080aef---lagalowomivatexuxopu.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0ff985a89---xiderax.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf08ea3e9ae---wubaxeregisem.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/7eedfefb18b181fdd77a1285d54f5933/24963591960.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086c1f6902b5---sifugarenatagudukeziz.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16084e67d1a32a---lajeruxurom.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a5eb13870---24555084588.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/cd8ec4ef2b2a7d30e5f41d59f377add0/xanuluxitabadiwevirogemaw.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/sinegebelokokafurasikenu.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abeeed0f622---77347145303.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/2g2lo34c650n19mgqbonv79dg1/vebidin.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a04f5c439---49191680887.pdfIn PDF document text
    • https://%{HTTP_HOST}/$1In PDF document text
    • https://%{HTTP_HOST}%{REQUEST_URIIn 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_off00015a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001722d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1722D 10668 bytes
SHA-256: 465aa92cd7ba10d1aba92067a30120855573dee302f14dc56eafc42793d4dc7d
font_02_sfnt_off00018a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A94 19044 bytes
SHA-256: 41ec3a9e6dd95843549cb20a4ad6958f853f75bfbb270610603fb5179ee4bb67

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