Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a67280bb057a725…

MALICIOUS

PDF

70.5 KB Created: 2021-09-05 09:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0a875dfee4ca2e35ffd2a0892db17c29 SHA-1: 09b38dd97e264aa6f3671fa31dcb59b39c49e871 SHA-256: 3a67280bb057a725d2cbae94054a6dcf4ad681ab537efdbd5ccbda970ea0161c
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. The file's structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://kidneytracker.com/ckfinder/userfiles/files/gawuvikagamop.pdf In PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/93e9673be7ce84d4c7f877cd012075b3/84250343135.pdfIn PDF document text
    • https://couvreur-hautdoubs.fr/internet_new/images_et_fichiers//file/94935960573.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f408311d21---35641516540.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/89648647667.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/pedazame.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/libde31d6v7vfj0tlu3eg22gbd/38374854269.pdfIn PDF document text
    • https://thekolkatapackersmovers.com/ckfinder/userfiles/files/87366443842.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/zutarinekogej.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/34766570078.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/2a4f9d64a27b976c0832f996346cab02/6549243229.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/buderuzamepilapuke.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/badawaludevofapo.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/14abaf373ba47abd0d2ffacfb22aa54d/xofijinepekove.pdfIn PDF document text
    • http://email-database.info/userfiles/file/gogamepufakila.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/41744965394.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///27557629269.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/surukeboveborunumutobeja.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/33161609555.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/753e55415d91b80645021ab8564b0382/xasiwiduvuxolumulitemiva.pdfIn PDF document text
    • http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/c74fbce44e917e56e2ea1d552203cd51/mopefotimotalazaxazoko.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160713b136af58---xavapugunet.pdfIn PDF document text
    • http://asfcursillo.com/clients/879797/File/fesanapin.pdfIn PDF document text
    • https://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b2358f312---melasupefos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=spanish+if+clauses+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_off0000b4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A3 10572 bytes
SHA-256: fc5c7f8d4cb8a8dd7f196a81ab83c1bde4871aea89381e4418b11ffcf82ffb34
font_01_sfnt_off0000cc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9B 16096 bytes
SHA-256: 548a874b02e52378525b2c12c20ccca1393e149859ff8e2ea4e5207b0169d6d7
font_02_sfnt_off0000f4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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