Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d96692c5b370275…

MALICIOUS

PDF

112.5 KB Created: 2021-07-01 23:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: dc9208d298b47eee038d50b006f873c1 SHA-1: dab3842a1c682e5fbb1a0f345cb68e7fbe17c1e7 SHA-256: 9d96692c5b3702753cf0ebc983194c93f1f88208abeab344316fefecd9c626c3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm, with multiple heuristics indicating it points to compromised CMS uploads and disposable hosting. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/m6io9surri40gqsjsmljsqlkq5/jisatakowemudumevix.pdf In PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082161baab45---96906540005.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/gekivizakotodupem.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/33858215339.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/93328893508.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160838f147420b---38667690214.pdfIn PDF document text
    • https://marbellamohali.com/wp-content/plugins/super-forms/uploads/php/files/cbcf9ea8399c5d2fe968a6ed23732f5f/8617055090.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/53364139800.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/cvt5hkqpho2uuuau61hf0pis61/sizonagaxugetita.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/54324888733.pdfIn PDF document text
    • https://aashianarealty.com/file/ninizunuwoduju.pdfIn PDF document text
    • https://www.basur-tedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd97f8885b---zewuxojewedaxav.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160732ebe52aff---zidevisudoloxalobak.pdfIn PDF document text
    • https://waroproject.com/file/vipopulimurufujuda.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6651528fd---61952161264.pdfIn PDF document text
    • https://daleplumbinginc.com/wp-content/plugins/super-forms/uploads/php/files/08c21890aa464d57937961719c191b7d/zakabelobobuviwe.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/gezerijef.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/mjsbgiog6853elecsjklm4o1ta/xakavudafata.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/b1fe0820d8e4b576e95e93314e90348c/jufajiditotivoxetutabuti.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/lorisi.pdfIn PDF document text
    • http://nomorecpapmachine.com/userfiles/files/74084248292.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/6ee2kdcr139qksq7fpqokc0os4/delokuwojiguvijokodukeva.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/paxiwumekiramuwaje.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210627_72FC416851CAF06D.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=selina+concise+physics+class+9+textbook+pdfPDF 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_off0001502f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1502F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16841 18928 bytes
SHA-256: 18f41d05e8707302d08cf3e70f9e88584f104dfb0ed2e5a9c408298b27351953
font_02_sfnt_off0001986c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1986C 11308 bytes
SHA-256: f2afae7558abe01d387a1f382f28a9b47cf08c29752b3a3e97b56ed4aa105631