Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a77988669212434…

MALICIOUS

PDF

74.7 KB Created: 2021-09-01 15:54:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 15f378e1555dfda528f6f10c0a80cf0a SHA-1: 147eadf779d4af3d5a2a01e18c7ca440d38d26c2 SHA-256: 8a779886692124340038f0d152d7f81c2e476da7959291df0ca0ea9dc0c31460
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress installations and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary attack pattern involves luring users to click on these links, which are designed to exploit or deceive.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://biblioteka-belzec.pl/upload/files/nonakubojemeni.pdf In PDF document text
    • https://globalmediaminds.com/uploads/files/gonusozimofutebesume.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c784febeba2---18406380907.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/ec54ff2e0b9e616b141f6838f59e0b8e/38460230964.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737ed463636---xodek.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/516dd828790580e0460e77b373344cff/setujotewijesozefigad.pdfIn PDF document text
    • http://industriefotografie.ch/userfiles/files/pazuge.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1622124286491801620.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ca030df479f95f7b8cf8e4ad1bf2c55b/48032480620.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/24695011953.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cb469245at8rm169hsa28gq0j4/91855269363.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/dakil.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/69481ad023f7417cefa6ead746258c11/4790445728.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/2u5gmcv120s8ljv1ilg4ek46m4/xalapuwesitigaripu.pdfIn PDF document text
    • http://husplaza.hu/editor_up/wexukewebufuzefegotoxazif.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/f0rfd0nv4tvtscdms0nk75mq69/pilixujux.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607075d24d69f---maliretedepegukifomisoz.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/47471015063.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/02e50545472d68e0d4778043939e1240/vikefisovis.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/64890188069.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/7d8172a8d7d0747173f8fbfde4c7c7c7/vasazimupavelifekenojege.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0dc66a46e---pozejelosukotuveneti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=quote+stars+in+the+skyPDF 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_off0000c33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC33E 16640 bytes
SHA-256: e5c1b17b6bf96480411da567b1733670f758b2c1f88b8d60b9a190b64325d2f9
font_01_sfnt_off0000edaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAA 10524 bytes
SHA-256: 6854810d147f5432767b9b185a715a76c6c764a94f909ba7feff0297d93660be
font_02_sfnt_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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