Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b8e3addc42421ee…

MALICIOUS

PDF

70.0 KB Created: 2021-09-07 23:03:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6dd9ff1f6161fade8918bb99db741626 SHA-1: af0e9e3b0228c4f729368f78bae7ba01dcb82106 SHA-256: 9b8e3addc42421ee3e3a9c8172dbc235b3f2dcbd7f0c1ccd97699dec17c07275
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • 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://myvideoclasses.com/ci/userfiles/files/jegokilubuzag.pdf
    • https://altonika.pro/files/fck/file/kutasesifopusejubij.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/efc42b9093c5a802ec470d17a7dd9ab7/rimesa.pdf
    • https://tasivn.com/upload/ck/files/22263926829.pdf
    • https://claudiodituri.it/uploads/58527471909.pdf
    • http://ideatity.com/ckfinder/userfiles/files/20098047143.pdf
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/91157561637.pdf
    • http://orikon.net/Images_upload/files/52616026514.pdf
    • http://xn--2-140-swe8h.xn--p1ai/files/50443824347.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/a04d8aa5adaa3bb6260092981f36e894/38552733031.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/m04p9nobtadsqqf7ehh76dpo32/jesaxeg.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607fffc4da4f5---xotamepi.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a796e287635---ruzazufovosagep.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9403c5ea86---28996688085.pdf
    • https://communeouchamps.fr/userfiles/file/loram.pdf
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/29765060580.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a602885773---38887507403.pdf
    • http://skupka23.ru/upload/m/bemesigijogujusax.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160782d13a5e08---82416154130.pdf
    • http://gianniarnaudo.com/userfiles/files/63013915455.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/0db1f7cbd44c242c783acc572704b104/98293140463.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/sarog.pdf
    • http://lamekatus.ee/uploads/ckeditor/files/fufovuzalizomotop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=tracing+numbers+printable+worksheets
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F9 16792 bytes
font_01_sfnt_off0000cc0b.bin
5ec6c8fcbbb507917e4f4f0c015297f11b422ae86805b73c6be4452f1f9f6c70
pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0B 14500 bytes
font_02_sfnt_off0000f014.bin
9062073d5fb1b7c3b61d18a7d0a2ae6848b66833658e5aba0f2e070811bf61e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 11200 bytes