Malicious PDF — malware analysis report

Static analysis result for SHA-256 160ab18a1442540b…

MALICIOUS

PDF

75.8 KB Created: 2021-09-06 23:38:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7c8576303320d0dbeba2f764a98ee5cf SHA-1: 52ad5b02284190b6f6851103d0d62c6caeb745c9 SHA-256: 160ab18a1442540be4d4c36d7c73f92cfa0e33b4d5432eb5cdca84cfc7771a39
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/dd6c20c2842ad7cd39247ff1fd4b996c/jixarir.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160876d339dfbf---35631648145.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a2bb60df7---38783577038.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/zavexobim.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/pazenibusi.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/fofuxijawilizomalatufibaj.pdfIn PDF document text
    • http://pekbdt.com/filespath/files/20210817162207.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/52580788422.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/venujefigugim.pdfIn PDF document text
    • https://ego-sofa.tw/uploads//files/202108021745363764.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/fomaxud.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609878bcd74ad---sobasoke.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d15d30fe1---timoterefapam.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/jomebumopirinuzexu.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/kamomar.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/fidelesef.pdfIn PDF document text
    • https://kar360.com/resimler/files/94687730809.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/tudevezelisowamedafad.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/wezuvuvojilugexemonawu.pdfIn PDF document text
    • https://isosklo.cz/uploads/pogolikezimiw.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/19865764844.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/10284385424.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/guniwatevenejaxugife.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/nilokekip.pdfIn PDF document text
    • https://jjpremiers.com/files/45861493313.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/hmajfck2rsu25repe1g18vmej7/narerafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=leroy+anderson+sleigh+ride+piano+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_off0000c3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3E5 17220 bytes
SHA-256: 0ff575368ac64e34173013fd3d5ad97a7635a8c84c84f34289ac078883508fb5
font_01_sfnt_off0000f094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 10748 bytes
SHA-256: 9941673578ca186f067c430579d7340accd9eff665ae3801f74b4ddc49cce4ac