Malicious PDF — malware analysis report

Static analysis result for SHA-256 14918ca3769dd3e0…

MALICIOUS

PDF

83.3 KB Created: 2021-07-16 09:34:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 950527a0e179e985a020727608ed019e SHA-1: 0ae21c76b1aed231a0bfdfe1e99d2664a28d4c80 SHA-256: 14918ca3769dd3e0c49c5dd3bf7ea01b06328ec33b5961d146e370a166624295
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier strongly indicates malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a2ccb403e---wunidax.pdf In PDF document text
    • http://apexnepaltravel.com/userfiles/file/46022955096.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/fiwokigakajavigikune.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/65420840900.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/janerodasofofi.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/14480772201.pdfIn PDF document text
    • http://gloria-eurex.com/kitilelevib.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/wedijuwu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a636a27977---megegebezojolutop.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/ecf51fa66ce1a6ae930287b94c6c9a21/kusibew.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/4rmcarl1dpsj3ipgg6mhucv444/89328215764.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/c151k8lh4jbjv25foqad069eih/kodefagal.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20dd83ca93---lekasigaxaniwogokikodaxa.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/nimojadodemixibowuguvuze.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/793e2a8bc0631813100ce90bfbe27f0e/68942416637.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/semoperi.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c01914fac---lasitezovuzelaz.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c614291da92---fedepilerelowuwe.pdfIn PDF document text
    • https://metricgroup.it/uploads/file/60589192937.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3voeoqjhmupc85vgttg2qge9qe/35722270898.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/vaxul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=meaning+of+automativePDF 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_off0000e1f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F2 17696 bytes
SHA-256: 96d8764b723381d25ab74f4e9073ea49299d9207085529d2c41f109f89721bbb
font_01_sfnt_off00011096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AD 10404 bytes
SHA-256: 939725a37fc36911f7243a842a990a3298e6958c81a71e445bed221e349954fe