Malicious PDF — malware analysis report

Static analysis result for SHA-256 73d74afe81d07450…

MALICIOUS

PDF

87.0 KB Created: 2021-07-31 19:07:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2de67dbd8dc4acbf2f445d8fdc8890f1 SHA-1: e33219ca7d429625e0504018b085099fb9e89771 SHA-256: 73d74afe81d07450f7b719e058fbcb62d04230159967e8f665bdff175af8d7a0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs pointing to other PDF files hosted on compromised websites, likely to lure victims into downloading further malicious content. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/lu7t0egthmacpfapfobq3epf8f/lomesedukokonewuzasepekox.pdf In PDF document text
    • http://beautybybelief.com/admin/images/file/79946351928.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/7b5d527e6a2cfb3326d8b773bad82be2/wazagelimovodekiwopa.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/87984658d3ee3059a18b5d058ee67669/13556603593.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/31302818213.pdfIn PDF document text
    • https://fwullong.com/upfiles/editor/files/sanos.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2a18c428b09f036e0aa30023a3f026b9/57366361531.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/pupebubezabosaverujudos.pdfIn PDF document text
    • https://www.profiemg.cz/upload/ck/files/komisowemux.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/95486475229.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/verof.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/36121046823.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/80609804680.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/14401ffedbc9bb2c31e21ac858e6f6e5/nomorugefajodipi.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/49069093c030c02c81d5e79ad38da925/fepadotubevuvom.pdfIn PDF document text
    • http://perila-vrn.ru/userfiles/file/20913392684.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/aluf3jttoj5n3j2vvh2bi9sv1u/wadufapibagusizupojota.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/kuzizipuzojutaxotivevo.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/92515205724.pdfIn PDF document text
    • https://inverpalmas.site/aym_image/files/xefiwo.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084711baf6de---43488627792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=whats+upper+and+lower+bound+meanPDF 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_off0000eac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC5 19132 bytes
SHA-256: 3c2a1b11eb3a80b0eb897f56b2488c614b22b2268019a6429f9ffe0784d26ca2
font_01_sfnt_off00011dd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD7 10884 bytes
SHA-256: fa3d52baf1c695c4410322f4446de3c8603e436ec72b3a13f0522e86df0f3d9d
font_02_sfnt_off000136a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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