Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff3e4b568cce91ff…

MALICIOUS

PDF

125.9 KB Created: 2021-09-02 14:26:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6206252be1a04504a49539594d0035d1 SHA-1: f2179bbf284d3f4608f386ea1b63c95d1e077cfa SHA-256: ff3e4b568cce91ffa86425e214157bbe12ed7a5afbbb188063dd1765d33e2fbb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.lebedosapartotel.com/data/yukle/files/ximuviruwewarupime.pdf In PDF document text
    • http://hbleg.com/admin/userfiles/files/21459437689.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9608ad4c1---51589197384.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/fojopisebebunopop.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210806_055FA639C1BF7E12.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/78846780592.pdfIn PDF document text
    • https://hoavily.com/uploads/files/nabukejutoxod.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3bc281732---38120009243.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/8d4hsilj6la5qg88lm381kdgvi/wuxodobakidaruwadonavug.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/95122891283.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/19723146990.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/muxupoma.pdfIn PDF document text
    • http://baggiez.net/userfiles/file/12107642550.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1609074aba92ab---pumererekalepebinitasol.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/25646079819.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6280473cb8---37747716100.pdfIn PDF document text
    • https://jotelek.hu/files/file/juwunugosolede.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/21541280820.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d887772b527---wimefozetatifinudewakovi.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/furasezinilebexipoxofaxa.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16093f8bc751aa---kubabetebarovip.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/48411092589.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607515ead7019---gidujizadonukevakutijubu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072be9505933---lijidivupatigorejoxoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kalila+wa+dimna+for+students+of+arabic+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_off00018337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18337 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00019b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B49 20000 bytes
SHA-256: c02c33a5860fe58802b1741bd710b393292a65c16801f4e16f2adcdbbad34ea3
font_02_sfnt_off0001cf9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CF9D 11100 bytes
SHA-256: a0bebd139b18dbc3743b6068ea9d0889a94e28d796ca08c2e282f547cab5ed01

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