Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fd484b87b7ca43…

MALICIOUS

PDF

82.7 KB Created: 2021-08-20 01:22:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 02fbc4223c4929970bca1e099884207d SHA-1: b3f5e518a48d3f972ed16e028302e4f6a62e8438 SHA-256: 70fd484b87b7ca43521a904280fb4cc68701fe1a2e9fce929931a13b0493dd6e
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d1d15613---xobubab.pdf In PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/2d8640231b98f0d7e69dcb991049005c/47185179288.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f177ca2eb---30131337280.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160fc86683f9c0---xogifaruzudor.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/eaa96ef594bb69b2698ec012ad63e08e/vivakituwuvu.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/3u6nid9l855glf18p2vdh15oaa/80571339503.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/migudaragifarumovelen.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/86946532143.pdfIn PDF document text
    • http://juentai.com/userfiles/files/38342057208.pdfIn PDF document text
    • https://begili.com/uploads/image/files/59885288387.pdfIn PDF document text
    • http://retrofotr.cz/files/file/70614160921.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/wobuzubepinolu.pdfIn PDF document text
    • http://www.kilincsweb.hu/fileok/file/bewivo.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9a9875db1c419952d2e0a1d0f697242e/39575269196.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/mjdhoht86jhl6ffra5ps6cqdbe/kixuxiwoguwigososut.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/piacpo1rte2cmhh90vpcs41h3t/vesomaloduxetifimudusi.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/55451897338.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1aedaff4071fcc9dc9a1978234232db2/favomuwusevijujas.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1627270340.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210722_184739_6857.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/nirurakefosizawu.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/nakuzulodeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=star+wars+jedi+costume+patternPDF 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_off0000df4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4C 11020 bytes
SHA-256: b03316f20397f0c988d870ea595bdfd8a5af714eb93baa7031d49f60e538f3b5
font_01_sfnt_off0000f8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 16972 bytes
SHA-256: 1ab115f59dceaeca8e216f7c26306e6003a2257fc3e5711745fc029da434fe9a

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