Malicious PDF — malware analysis report

Static analysis result for SHA-256 00250dbdd564c6e1…

MALICIOUS

PDF

85.3 KB Created: 2021-09-10 22:05:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7b7a47fa6254d5ae52d0d20f3c56850e SHA-1: 1f5905b657a5cd4031ec75cb923c91dcf7c28a9e SHA-256: 00250dbdd564c6e1d6106e07daa110243e19b9aed5733a1d6d09b8057adeb6f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a phishing lure aiming to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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 http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613a077c9760d---70834083188.pdf In PDF document text
    • https://anyimaker.com/upload/users/files/85103884875.pdfIn PDF document text
    • http://fedime.org/imagenes/ninotadu.pdfIn PDF document text
    • https://koratspring.com/upload/file/32050506454.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/25972594502.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/10300866972.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/kuxefuvivovetokizopawes.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/34649820876.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/kolodugojinegunivam.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-6/20210906053107640052.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/jisuwegow.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/fegaligi.pdfIn PDF document text
    • http://cuathepvangohaiduong.com/images/ckeditor/files/55083808796.pdfIn PDF document text
    • http://globalone-mould.com/gbw/fckfiles/20210909012335.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab4f2dc5c4---75559413582.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/pabevasisazaribo.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135c508866f8---tifebezired.pdfIn PDF document text
    • http://mesterteto.hu/userfiles/file/woropaxa.pdfIn PDF document text
    • http://carraracucinecomponibilitrapani.it/userfiles/files/53925860510.pdfIn PDF document text
    • https://asiapharma.la/files/files/fetikigevakuzujeb.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/zinerer.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/kemesonobeniwekalawipo.pdfIn PDF document text
    • http://satyavnetworks.com/fck_upload_images/file/24851695004.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/17149235250.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/jezid.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/gigevolufikadowaxiwob.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/36689199028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=real+bike+racing+downloadPDF 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_off0000e9fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9FC 10644 bytes
SHA-256: 7908b38351e14868659c7179b25d3d34a27ee04dc22829f48f2ddafb9fd65f02
font_01_sfnt_off0001023c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023C 17184 bytes
SHA-256: 2c1372bbeb7a09a648fcbf0ec0578270042ff596878ecfb3d0b4866a8b05c48f
font_02_sfnt_off00012edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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