Malicious PDF — malware analysis report

Static analysis result for SHA-256 4faa88db8f22305a…

MALICIOUS

PDF

128.9 KB Created: 2021-07-07 06:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92fff07e79ee86a14a9ce3d4f1458f2d SHA-1: b84aa2cf684e64f8c24274ea32c6198797a8eb20 SHA-256: 4faa88db8f22305ac2ca92181781fb3b40312f60cd4f4cddf1f99683bb685069
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to potentially compromised websites. The ML classifier and ClamAV also identified it as malicious. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or malware distribution, aligning with the 'Spearphishing Attachment' and 'Malicious Link' attack patterns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9895

Heuristics 6

  • 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 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://daedukgs.com/admin/fckeditor/data/file/20210707100547.pdf In PDF document text
    • http://artospace.com/pics/file/70649839700.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/rizazaxekufosegak.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160820b1c76045---91518707948.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e153ac8992---siwusikedejijup.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210609183843.pdfIn PDF document text
    • http://chiaranannini.com/userfiles/files/felijaw.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/62udqmskfr4s6hvoggadcjivm0/13190182972.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60b5d850d2---25718735619.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16078149d3fd8b---debemedej.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b7805dd3f96---desizewuxiraguwa.pdfIn PDF document text
    • http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/92875986816.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bffedb6c29b---24750162098.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607c02be44b93---1520602549.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/dd4f69fb6373d886cb2e0ccd89423eab/82556109375.pdfIn PDF document text
    • http://donaldbermanmaimonidesgolf2021.com/clients/0/0d/0d43fbb8ff91cab41fa1b056c0d912a9/File/69710536330.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k9qj6oj25fgbn6d6cgd3lcllsv/tozifepuxaxuxamumagebozas.pdfIn PDF document text
    • http://jinshi66.com/uploadfiles/files/fegavikikumeraguxigekena.pdfIn PDF document text
    • https://red-adlay.com/upload/files/50847520789.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/abc17233c1c3d55b541379eccd6b70ce/fosesoxisivitulukipebik.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160945bc29842c---tezixog.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1eea51f913---geveru.pdfIn PDF document text
    • https://service-panev.com/userfiles/35071181181.pdfIn PDF document text
    • https://cdpu.net/wp-content/plugins/super-forms/uploads/php/files/7cd8407d17d17523a21beba4e0a7aef6/61624039632.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae33aebde8---27561678085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=messenger+apk+for+android+7.0PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001ab1d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1AB1D 28364 bytes
SHA-256: 05fc9aba640b36419e0ac8738bdc252e2c98bed84454fa1114f3d01a5231a5ef
font_00_sfnt_off00016463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00017c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C75 17744 bytes
SHA-256: aa9d13be2a00129690626073e515b5957efcbc7a5abb70be376a511cd762b212
font_03_sfnt_off0001dcf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DCF9 10852 bytes
SHA-256: 41eb66f938ed38c93a126b532a73a9279121783cc14e5072d21d699351ccba50

Open this report in the interactive analyzer, or submit your own file for analysis.