Malicious PDF — malware analysis report

Static analysis result for SHA-256 1016cdb18ee36ffb…

MALICIOUS

PDF

81.6 KB Created: 2021-09-05 05:31:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0acf53d8d49ab6b39f6502be80767f79 SHA-1: b0c399628b08d5a6f7d154316eb25b77b5aa9081 SHA-256: 1016cdb18ee36ffb67f3f5ae8c23268018f0eb593caed4f52bc8ea3d251c467f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://hebammenglueck.de/ckfinder/userfiles/files/temuferi.pdf In PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce556bc481---69305937158.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/tuzoziximigoluf.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e971b302c8---xabefamunodiparozi.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6460812456---61713502362.pdfIn PDF document text
    • http://regcureguide.com/files/files/55383089822.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/57886715504.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/965c41f4231c3ebe6f7e71e6b3f2bd75/liraxotozomujupefu.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/zodegis.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e48d56120---sefadofidugasipipo.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/bc22a1874ad0c10c45a09928611a4b57/nadokufukigidi.pdfIn PDF document text
    • http://thucancakoihikari.com/luutru/files/lumoruzokumojovilekatar.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/36071882302.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/zufisirejebewaxorizowutib.pdfIn PDF document text
    • http://minhnguyenvn.com/uploads/userfiles/file/fezapovozupilojadedi.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f225f12f5666dd8590d62fc6c40d2480/44923550530.pdfIn PDF document text
    • http://longearedhounds.com/clients/65743/File/fetipiviz.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/45830673089.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210703152208.pdfIn PDF document text
    • http://www.saaegfpolis.org.br/ckfinder/userfiles/files/zarisuxisuxitid.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/641a9151af1416f192c08e9f4fdf9504/44725088923.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160887aa30d517---54451526291.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/76061814357.pdfIn PDF document text
    • https://artenika.pl/fck/file/zevuwupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=united+states+constitution+full+text+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_off0000d84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84B 10720 bytes
SHA-256: bbc28eac8242459d8299279dd6f27d042920158f68cdb37335d4921215bcf7e4
font_01_sfnt_off0000f113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10925 18388 bytes
SHA-256: 6d151a5d6c41ff46288d5a4fd45824f2ea5bc0641c03e51e6e9a7ee99f9e7011