Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d77d4630484d00c…

MALICIOUS

PDF

87.0 KB Created: 2021-08-08 03:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bc34e2f4531cd593813fc8b4b09336d6 SHA-1: 43897b1affa6487ad8efc6533ae0bea3e6c58391 SHA-256: 6d77d4630484d00c655205b0cadef7db1b3feb2d87b47a20b5418ddbf02c972e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://gpmpoolandspa.com/ckfinder/userfiles/files/7825632346.pdf In PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/bitoraxim.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1608aff8fbfa8a---gukaki.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/nuvugewagotimemanusijemew.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c67363231c8---21677421620.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f39355e13---guwezanudefar.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090d3debdd15---88998341563.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/fmg7e55d40moh9ottm7ga8mo1j/jedudo.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/wewunovidazibaripejewabe.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/80545733969.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c01994c7218---61324894666.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/30223532678.pdfIn PDF document text
    • http://sanarina.de/ckfinder/userfiles/files/58112753162.pdfIn PDF document text
    • http://minicabii.com/survey/userfiles/files/lixolupenajerefagepa.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/60b4d02605159d014d4d19af0be62fed/bixesogenekev.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/36133809441.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/26131351630.pdfIn PDF document text
    • https://indianpowerliftingfederation.com/userfiles/file/53724967034.pdfIn PDF document text
    • https://coevent.ru/upload/files/divudajopijinovib.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/1607372e5cee46---mebevoxape.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/gopizefiduvumim.pdfIn PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/0da2b157e312732e3c2908f345378000/winolonebun.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/gololupigiwojatili.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2bdabfc43---migovaferuwabutojaw.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/62647027497.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/e61q7uh2o3jc2igij5lmp4qk1v/12610685622.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=jello+instant+pudding+pie+filling+recipePDF 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_off0000ed26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 17832 bytes
SHA-256: 7f1cc1d76a56cfdc261cfb6ead7311443c6c1cc79310a1bc374e166655238040
font_01_sfnt_off00011c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C09 10888 bytes
SHA-256: 51867f0d08eeaf594d25f85c072ec38e65e23126acf620a490383c1019eb6af6
font_02_sfnt_off00013527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13527 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1