Malicious PDF — malware analysis report

Static analysis result for SHA-256 0768aafded38b2da…

MALICIOUS

PDF

71.9 KB Created: 2021-09-28 13:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b2457cf75289b1b5b299677ec44332b SHA-1: 1ade4169a2558f58aeb10ed74e535171858648f0 SHA-256: 0768aafded38b2daafe117a279629db1976936ea44d8a0adf92328c4c2cac9e9
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to redirect users to malicious content. No scripts were extracted, but the primary attack vector appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://ketchas.ru/uplcv?utm_term=zinitevi+apk+for+firestick PDF link annotation
    • https://hearing-outlet.com/uploads/files/202109110922206773.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/73786786719.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16139673403951---40299641420.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/pitirudidedazadipanij.pdfIn PDF document text
    • http://tomboy2.com/images/library/File/12439671123.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/1f54d9a2ff629ac23285a6a91ff761b0/94023080174.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/pufuzimabozubijizilinu.pdfIn PDF document text
    • http://esejsc.com/upload/files/67984905249.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/85866217041.pdfIn PDF document text
    • http://allineers.morefriendship.com/upload/files/65795657221.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161510610efcac---55893057511.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/21415798584.pdfIn PDF document text
    • http://viorina-deko.com/images/file/65492972062.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-9/20210909043341570442.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/161467b3aca043---13254765453.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/rofufukagofak.pdfIn PDF document text
    • http://candybeauty.vn/upload/files/wasuluzogupitami.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/zagipiganokuzijo.pdfIn PDF document text
    • https://riolisboa.com/images/ul_files/file/wKmuRZfgQlBW.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/78687118141.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/vl5036hil8nsk74thou00ph6h0/kalosapinadep.pdfIn PDF document text
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/16708841533.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/jilobikaxado.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1b749eaf0b81d2769f6187af6858d4d1/fulelufakuxagax.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/81147270435.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/90882715066.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/nedubirunorizotipadiva.pdfIn PDF document text
    • 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_off0000b3ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC3 10548 bytes
SHA-256: d2ef0a7773b64d8350d2fb61200bfde72773068a6ddd25407aaaa84e49080070
font_02_sfnt_off0000e402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE402 17748 bytes
SHA-256: b32f24e4ffbdfc424450f9d1d239276a41b0fad9929b47f7c4f29306cee8253b