Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5679d653d33576e…

MALICIOUS

PDF

76.9 KB Created: 2021-09-03 01:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0c6d0945793c8331bf9d69cf02195134 SHA-1: b2f820b83ab6b82c208763f6b886596036e20994 SHA-256: c5679d653d33576e668fd6feb44fc8563bb11de06cb41d5269c9c1ac61b07b75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous PDFs hosted on compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the structure suggests it's designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070cc00ea7c9---97230836876.pdf In PDF document text
    • https://xn--nmqu14inmf.com/upload/files/93524165803.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/loparitufukarasivozab.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/68163783586.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/si85q8a2aan21d0uu3q9q7ca5a/pogigexipitabakasepib.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/84170085930.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161043c76a4a16---nutelosunawa.pdfIn PDF document text
    • http://miroslaws.com/ckfinder/userfiles/files/solanomelaxudowefu.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160afdf523ea8e---xiwafepibowezapa.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7a10ef329---kisejuwidikozuxer.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7b8d3803a76e574d340d17f7f954c94b/mosatobu.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16075dc3058184---5645239133.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/611793a3e43d8414dc82e8614010434f/gogopumufuluvajufidat.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7a4f94d1f---gitilatidevale.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084717ece975---wogexal.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/kemolinexizikubidaba.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607e92319c846---51531049479.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/uefqoka1ir5qmskl222ah7euv6/mafonusajog.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/90034835459.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/nuradupegojenipavaro.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/140bcb8fdf9864ccce9bbe85598a012b/pofumafaxom.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/bisaxananiz.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/rugufasegoladesapidag.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/warobinufemujufonotise.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0b52451c14bc01af971f25949565b9e3/38414981406.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b84b1f791d8---mimegawizaxovaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=reading+comprehension+test+pdf+grade+5PDF 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_off0000c6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 17436 bytes
SHA-256: 201fb21bfaa4d3c2000be9e52a4293a0d7869ed7287894a0e397ce6038db0c35
font_02_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 11200 bytes
SHA-256: c6a256ad37465dec1324e385e4c96af89193a62428ef2685b9efa6a653989aa3