Malicious PDF — malware analysis report

Static analysis result for SHA-256 c395cedde5f93edc…

MALICIOUS

PDF

101.3 KB Created: 2021-07-19 23:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6e02bcb474efc149029d57a20c68a24d SHA-1: 4aef02a5c3393d85d3c601ee019c8e662db5a1dc SHA-256: c395cedde5f93edcf1848e57883d7a8064838a9a8fc0fa515d8ba97c5f3d35e6
96 Risk Score

Malware Insights

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

The sample is identified as malicious by an ML classifier and contains numerous embedded URLs. Several of these URLs point to PDF files hosted on compromised WordPress sites, suggesting a link farm or redirection mechanism. The presence of these links and the nature of the hosting indicate an attempt to manipulate search engine results or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 5

  • 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://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607482f97882b---22715993340.pdf In PDF document text
    • http://geodavidepini.it/userfiles/files/15977039278.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/notuvagolixedewavopar.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/4d1fc8a258d6a62804a625b61467ddad/59208357078.pdfIn PDF document text
    • http://wawa757.com/uploads/files/39143314515.pdfIn PDF document text
    • https://irantruck.ir/data/file/rezorapipemo.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/63335624247.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/puwukogebozodaniwi.pdfIn PDF document text
    • http://angeladaniel.eu/uploads/files/rubawateselot.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/e50a174fd2f0c5e5a0e2ea838181b156/xawaw.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/f6f9432a036492659e3fe21fddfcaf40/2562842028.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072239b360d8---26085409024.pdfIn PDF document text
    • http://kolaykanal.com/userfiles/files/rafatepovinowubewiwoz.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/eenrudl1akd7eg428bedptom37/mexabizumonogivurasibum.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/084e631eb36ea0ff85e1c08b7daa2fda/77861329374.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16080b25c50aae---lezesutadakepopapa.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160badef5140b6---44452041838.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/ca6ol36vi9cungbp2sdobkhanm/vumabufakizexomarovijok.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/jp8vajk9h5ag62opuqoouvb370/rogotolego.pdfIn PDF document text
    • http://orikon.net/Images_upload/files/degusidegepeb.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/83524952155.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/zasarupifijukimitur.pdfIn PDF document text
    • http://www.toptehnik.si/images/pexivariwurikiwunuxudepad.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/wavofovexezupizuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=beauty+poem+class+8+questions+and+answersPDF 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_off0001259f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 17560 bytes
SHA-256: f22cf1b30d981d67b4611a48d802e6dcf33a9feeebec0fe2f59213e91c13594f
font_01_sfnt_off0001536b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1536B 11380 bytes
SHA-256: b18139173def1deff17829fadbb3c09c6b90cd0113188c77bf84e96ebb9a38e0
font_02_sfnt_off00016e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1