Malicious PDF — malware analysis report

Static analysis result for SHA-256 583db6b6698782a8…

MALICIOUS

PDF

75.3 KB Created: 2021-09-02 06:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d9f5f290e94b1b1f0a5aea82fc1957ed SHA-1: 3853400cc49fd0ee32d25e80235248ca59e12000 SHA-256: 583db6b6698782a886d050f2536dc99f40148253343fd4cc1e70bb0bc79ba30b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a link farm pointing to multiple websites, many of which are hosted on compromised CMS platforms. The ML classifier strongly indicates maliciousness, and the structure suggests an attempt to lure users to potentially malicious content or phishing sites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://merwepizza.com/upload/file/30886257578.pdf In PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19d68b9348---27150973428.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d509d8b5b2---41772106117.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/16342494148.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/mobameda.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7dift04g647d6m9bo70t5beu24/69444974431.pdfIn PDF document text
    • http://jestbogiem.pl/app/webroot/uploads/file/99609246472.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/73638080080.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/48221701762.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/rabizedupupowuv.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cf073349b---gokajeraduke.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/32014984209.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/90196484910.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609044e4e6582---81444978348.pdfIn PDF document text
    • http://iphysiology.ru/upload/sawimewonono.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/jokidojukikezekikezuta.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/7c9b52d0a0ec10c63eab804eafa2da1d/demevul.pdfIn PDF document text
    • http://hladonural.ru/upload_picture/47183418376.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071db2163602---natokem.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/62633100043.pdfIn PDF document text
    • https://quatden.vn/webroot/img/files/7421295238.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/6d00ab8fe56086aeb86f91b8f46f50be/lumol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=scared+to+sleep+because+of+dreamsPDF 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_off0000c455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC67 16528 bytes
SHA-256: e587798f0cb5bf8e37ecd8d664f582f418785bc6426911c16c4298aeee72549c
font_02_sfnt_off0001065f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065F 10900 bytes
SHA-256: 2eb049be63cfb8e0915d4925e2dc8f2adc519e536c4d8276c5300ddeed3f5818