Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4650354943414b…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 01:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b74b5f4fd9db66f765c2a461d68ffbeb SHA-1: b5185714f971e9b1da5f7579013dde429b305ae7 SHA-256: 7f4650354943414bb0d4bc83788db4b5ebf1df89811502574f698aebe86373fa
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading further malicious content disguised as a PDF. The embedded JavaScript and the nature of the links suggest an attempt to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.parinet.fi/tiedostot/files/giraf.pdf In PDF document text
    • http://www.halpellet.hu/userfiles/files/13511272199.pdfIn PDF document text
    • https://www.dtd.com.pk/ckfinder/userfiles/files/baloga.pdfIn PDF document text
    • http://veterinarioassociatopacinidallatorre.eu/userfiles/files/4103072373.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/nomefolawopemisusuduwa.pdfIn PDF document text
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/jazalajopodesuwal.pdfIn PDF document text
    • http://www.mananthavadynorbertines.org/www/js/ckfinder/userfiles/files/59408022806.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/2326365924.pdfIn PDF document text
    • https://ancoraeducacion.com/images/61660745059.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/sobuvopirugalesemixabi.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354173718e2---68696490912.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/75559262497.pdfIn PDF document text
    • https://aventuraholidays.elladatravel.ro/mm/file/bozusanugebixotusezibepir.pdfIn PDF document text
    • http://www.astmalek.cz/obrazky/file/ralesesavasatomagozazurab.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/80291828044.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bc982b275e---bepuwuxilibipaw.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/86351127627.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/mekuzipemige.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/pisoxosoxip.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/zulokikiniwivodagi.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/moguxapamanox.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/farijofan.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9a3b7e92e---67998098193.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=how+to+take+notes+on+pdf+on+ipadPDF 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_off0000b21e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB21E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA35 10512 bytes
SHA-256: ae0f3b22ff28272000c4fc31e76456c51acd233c631340e2f7063f830b3912f3
font_02_sfnt_off0000e250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE250 14728 bytes
SHA-256: 78b436e94a45e5bf4d21e640ec058e536f136d6fd6af9f00b5c13474d0f9657a

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