Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb004dc8f9a82471…

MALICIOUS

PDF

109.9 KB Created: 2021-08-11 17:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4be724d396a4270404de6450325a1e85 SHA-1: 4a8800609b85842830b15246abcfa6649dda3330 SHA-256: eb004dc8f9a824714ce796cf52872380ac217411c008af786144ae77c4f20dc1
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised websites, many of which host other PDF files. This suggests a campaign to distribute malicious content or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, and the presence of multiple links to compromised CMS uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb30c8e302---69482640046.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d3857ab55---72209758183.pdfIn PDF document text
    • http://karthikeyanjayaram.com/userfiles/file/78271716558.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/nti72adhb617kv59pqq6f9kh96/81000138300.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/fa510ee37eb2e9c7017e2bdf7213072a/zidemaxilolisapimomu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f84695554---90555826179.pdfIn PDF document text
    • http://chip-chup.hu/upload/file/29219839872.pdfIn PDF document text
    • http://ideviceplus.be/app/webroot/files/userfiles/files/mepamizexidologesa.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/4f68ae22446e579e9825607624288284/pidilasiximulu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10e9c666b---jodusifesujofarego.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/5ecfv0nrh1g2vchun539qq1rq9/10512674764.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/da81556b4741514786035f5729280277/xarorubawonajojisokekaxi.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21b1746aec---8848590978.pdfIn PDF document text
    • http://ih-consultant.com/ckfinder/userfiles/files/zunufewaxudewibumubu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/28c2115343674a2515bd232d5d52a659/75108217614.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/tetejapapirim.pdfIn PDF document text
    • https://tempegaring.com/contents//files/75369567249.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa3c3847e5---loken.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/giduxetegalo.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/98358091373.pdfIn PDF document text
    • https://xanbiente.de/userfiles/file/balanamekebowizezuv.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/40495661936.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607736b7dc577---viwinoxerifiz.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/zapepovi.pdfIn PDF document text
    • https://noddy.nu/images/file/39325293399.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071eb2a14eac---86714877379.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sermones+bosquejos+de+toda+la+biblia+james+smith+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_off0001424f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1424F 11352 bytes
SHA-256: 3cb5031da210b999201db7b3535b4e142de5b0e207ce29719e63c1aa7cdda4bd
font_01_sfnt_off00015c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C55 21124 bytes
SHA-256: 4b27191a4577e6ca7945e177fefe0fddb2164e993d2756afd4fcae6730487f3e
font_02_sfnt_off000190e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x190E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1