Malicious PDF — malware analysis report

Static analysis result for SHA-256 7add457ddddcdc61…

MALICIOUS

PDF

86.9 KB Created: 2021-08-12 17:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 8e7a587cf4287b3d77fc8dc0dbfe2184 SHA-1: 8d59c75ef38e288b9acfcfbbe664808f0a879712 SHA-256: 7add457ddddcdc61031fbaf5e3717f8bcbd1363c1b343f887780a4d732a2282b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress installations used for hosting PDF files. The primary purpose seems to be directing users to these external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01c1946ff---40631483994.pdf In PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e0439ca3729---27173944061.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/6702525736.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/86536848801.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/ruvijomilezanigidi.pdfIn PDF document text
    • http://cbcom.eu/ressource/site-image/files/xunimibisaf.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/37715665600.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-3/20210503222903702453.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/2021430113251974.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/17893413577.pdfIn PDF document text
    • https://asiajitutop.com/contents//files/sifufitugamavijuk.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9403cc8ace---supepazel.pdfIn PDF document text
    • https://serviceservice.eu/userfiles/file/231697286.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/98880275826.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/40948997479.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160b83e4ce3b95---70054740898.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/wakavotedimazimujexete.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/5032406815.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607072cacdab3---53488823263.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160d6067fe959b---bexasumizamawuzasodepuw.pdfIn PDF document text
    • http://mwclass197050threunion.com/clients/0/04/04fd426b2d2cb16e649a8dfb8bed347f/File/napalusukobotegukuv.pdfIn PDF document text
    • https://premiersuli.hu/files/files/xunesepomorodij.pdfIn PDF document text
    • http://mcutech.net/upload/2021/07/file/16257070171727148999.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/rdhg8hg6ee3nu4hutrracmgpi4/tuvufezaxazujapa.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/nomepazemaduwibubupog.pdfIn PDF document text
    • http://hrdiborice.cz/erucom1/files/files/26911210448.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/a5b43b845b67d16ab781bb495a66b56b/kotazudagokasof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=oxido+de+bromo+v+nomenclaturaPDF 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_off0000ea66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 19556 bytes
SHA-256: 08702dc6105ff1d709dabf28e691534d21f85f5c2d3e25e33ad05ff0dfea54ba
font_02_sfnt_off00013381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13381 10796 bytes
SHA-256: 434d5bc8f0476a697f17af31b592064133f2040509481639b364e46a7da58428