Malicious PDF — malware analysis report

Static analysis result for SHA-256 8848227c058f2b80…

MALICIOUS

PDF

84.4 KB Created: 2021-06-27 09:23:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 06f1f498b4732cacc08eaa71ed2b6de6 SHA-1: be3e9f405224403fe91ba845c491b412df5edeb2 SHA-256: 8848227c058f2b809d6b96e6d08cbc928559ae1546c6e0a30bfb8706388c9d5b
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS upload storage, suggesting it's used to distribute further malicious content or phish users. The document body was unreadable, but the presence of numerous external links on potentially compromised domains supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://cunningham-reunion.com/clients/7/73/7399477c88ef979e1ad3ac38e42cffcc/File/weguvijud.pdf In PDF document text
    • http://terapeutickemasaze.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4c729814c---4951523973.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/ec131ab8af0d9d0e7589dfa7321a9766/86817222485.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/tiguta.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c62e3cdae3f---nufow.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d7561cfad---67077053114.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/60741422854.pdfIn PDF document text
    • https://stopserv.ru/files/file/kavuxibowidoluteduz.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/menajuruwomaf.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/61262236934.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a96f395545d---bopetepogokanizi.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ba177a779---20574581727.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609903dfc0946---67960332833.pdfIn PDF document text
    • https://hissekurban.com/resimler/files/39926684625.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/e24479a781d083a25749583c75f1710a/78973958420.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d6040e67578---99183033270.pdfIn PDF document text
    • https://anfauglir.com/images/file/felaxogaveditileme.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609031c7082b1---sagumawegiwojilotarase.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba91165d5ef---jubafewisefakonuzalexi.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zufugupig.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160708d6860705---gagum.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/r7i8fo0asd82b8ri3ltenp00b2/73876924457.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fuwovakezadewimefe.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/juxuserajefok.pdfIn PDF document text
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbf70a4426---75156594101.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=bootstrap+simple+user+profile+templatePDF 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_off0000e7f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F0 10568 bytes
SHA-256: cd90961e4378f42c7c5d023b6eb4689a2f97261835cf33a5feaf4d4baad33451
font_01_sfnt_off00010020.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10020 16236 bytes
SHA-256: c4b7d21ab74b4b3e51ea24f8d4aac830ff256c543b4bfd9e627597acff2b4448
font_02_sfnt_off00012a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1