Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b597553c4ab573b…

MALICIOUS

PDF

82.6 KB Created: 2021-08-01 02:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0bad930022ed8beb080502ffa0f97c2 SHA-1: 1635604bb47186a41f93c03f5dfd41ead8eda636 SHA-256: 7b597553c4ab573bef626339d9f6e2c7d9cced717d7f0b98d9c8a594500cc616
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, likely serving as a distribution point for further malicious content. The document body is unreadable, but the heuristics and URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/r7rpvh3k35b8ijac965cdb0vfu/4305628897.pdf In PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee60911732---67732078983.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160c728f6830a1---xitekakorazud.pdfIn PDF document text
    • http://capesociety.ca/uploads/files/503735660.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c541ea9cbb0---20896349782.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870516e9899---rifatu.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/25111841001.pdfIn PDF document text
    • http://web-news.eu/www/pkpar/userfiles/file/9518208866.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/xubow.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/xitox.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/39031595623.pdfIn PDF document text
    • http://horlickhigh61.com/clients/a/ab/ab3fb267cc30d45b98f460a20cee0b8d/File/fonifozugomobilogo.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095c69a8f14d---29321491327.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/4656396047.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/17016193614.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/63983180993.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/30594688621.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090b36c3570f---30259160282.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/guxakugosirobiviman.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/4e3a276f56547fe99eb17320bc6c7177/28596790233.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f30e6ee67ef---jovixexeb.pdfIn PDF document text
    • https://jamurgoreng.net/contents//files/48642412396.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/zaliro.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d443adb0a---zozupib.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/pelemuje.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/kikilojejasefewovemiga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=grulla+de+origamiPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE07 10360 bytes
SHA-256: 9910cf4e026928b4d5814f48ab644d19fbac04a3f8655a1ef29e6a4713f32789
font_01_sfnt_off0000f52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D40 18248 bytes
SHA-256: 8b8e55b03464e020a2dde1127003c1132580a8245ef2681c9aeaa1f6659e6446

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