Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b8f04d5bdadbddf…

MALICIOUS

PDF

104.6 KB Created: 2021-07-23 12:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a3502d97c4c9f94b2359365fa87c742a SHA-1: 4aae673f268942a346e9ede0bbbdd4a2ef6eb98e SHA-256: 6b8f04d5bdadbddfa9e9a98cb0e633e6a7ccef53bcb12bf76c79323426d074f8
96 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and utilizing UTM parameters, indicating a link farm or SEO manipulation tactic. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the structure and heuristics suggest the document's primary purpose is to redirect users to potentially malicious or unwanted content hosted on various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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 https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f50c38eb0---73782039326.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af9eeb0d28b---satijodomatase.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796b488a6ff---nologajizokamo.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/68830833850.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/43081814968.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3b122c0f3aa8e0c99589f73670d3dc0f/37312768221.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/d6a066010b2be14c0f70ce27f5db6952/dusinurepir.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/babajonez.pdfIn PDF document text
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/ernlm1d1295ljobn86r53h737r/19802744191.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/bf729f05138ae370c8357753358bae6e/44336806246.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/81089184878.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/43506801240.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724b59555d2---72780079491.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607af532e51cb---vagofudatazabonam.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/95ffb81b81efede156ab15bf2628adf5/sadatopuduxarovafokusobet.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/wovilijolejaginele.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/f91552843e08a81a6143e309e06c0af4/13771992689.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/guxenexinasij.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1b9ka5gvpl5sr6iue1v4ur59i0/32783866166.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b90c60166---74488460751.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160885ec151055---28919214778.pdfIn PDF document text
    • http://kapli74.ru/upload_picture/tujovamog.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/ftd7njlcc1dhcp6tmup5hb6i05/8160655860.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf0ded807---37985623135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=class+11+physics+question+paper+with+solutionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011adc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000132f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F3 11000 bytes
SHA-256: ebce998ce6c471e4709d375b56acfea3f44cf53b649f9edb91c25767b1d04d69
font_02_sfnt_off00014c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C9C 16088 bytes
SHA-256: 450eea5fc67953cc3bdc764260aa6f1739571c17331c9588074966c3dbef4c6c
font_03_sfnt_off000161cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161CD 19000 bytes
SHA-256: 7c4656d568c6ed72617f2b44abf4085b17d1c62015361df6401599308f9ab6c9

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