Malicious PDF — malware analysis report

Static analysis result for SHA-256 aac94dff8966262a…

MALICIOUS

PDF

88.5 KB Created: 2021-06-25 21:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 33774f0fab4556c9a2dd9cbaa756d31e SHA-1: fd143104a15d2b17e5735388a272b548fbccf248 SHA-256: aac94dff8966262a595b995845c293b8f7a843547db81a92a2f414a6a3fc200e
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous other PDF files hosted on compromised WordPress sites. This suggests a tactic to manipulate search engine results or distribute malicious payloads indirectly. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised domains supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://mosallaesf.ir/uploads/ck/files/28589118411.pdf In PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc333c213f---rudojorarabakofamokopat.pdfIn PDF document text
    • http://contactconfiance.com/files/files/rutokexemasoni.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/jogerekobesuragaliri.pdfIn PDF document text
    • http://mysistermyfriendministries.org/clients/85776/File/97551224690.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792dbfecec8---85954921624.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/lav70lrbc60eb7m01fjacfuafp/nipedovimobuxaguzokiti.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/25467341612.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/2o13k0hctob2ottlgvs3vl7063/68428638033.pdfIn PDF document text
    • https://synersys.fr/contenu/file/xavofisuwonekegekiwo.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16077d6ec0b14b---suganulawikumijujamatanu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/v1evdagjue1f2c531judk2qj55/jejuve.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/6ebe749f71f43dc11ff39c6d320e4aba/98417299767.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cs6v27lvausaqnfcohoh31bpo7/lidokumeme.pdfIn PDF document text
    • http://abnicum.com/files/file/womefepifepaxewizago.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/refafurikafuzunare.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/leliv.pdfIn PDF document text
    • https://scanclean.bg/upload/ckfinder/files/papawaxa.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/nigarololotifekega.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac87a8b3aac---61301230291.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/pafugorol.pdfIn PDF document text
    • http://placc.info/up_image/30330470012.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/58831220426.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mory%27s+temple+barPDF 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_off0000f57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57F 17540 bytes
SHA-256: 9ff60d624a6c45ca5f284cfb23b622008d20c952410f86d0b3da72d9981813ca
font_01_sfnt_off00012399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12399 10496 bytes
SHA-256: 3ceb1ac05d1106b7ae78177e034df004f1b9f37ad29552596cb738acf54cfc52
font_02_sfnt_off00013b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1