Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ac2851bd136c1f…

MALICIOUS

PDF

78.7 KB Created: 2021-09-04 01:27:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 576ac6cf7d12d3b30ed69b3defe9aa78 SHA-1: 967e88aa9acd3f702802143ccbf78ea65daed2d7 SHA-256: c0ac2851bd136c1f43cb0c62628be4e7f4c5e163a142a7e36170ec8744dec01c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to manipulate search engine results or lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://tonmathunglan.vn/upload/files/dojaj.pdf In PDF document text
    • https://groupburuemas1.com/contents//files/68170301804.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/31144396226.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/gubigexisisopuse.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607713a47dfb2---xojajetit.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607bffbdb634b---82435333680.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/97193393067.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827d2864ff4---96556946161.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/savilaxumapuxiwizofapok.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202108280646339443.pdfIn PDF document text
    • http://ligneus.hu/upload/file/fewikejipajana.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/3185172444.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/3430702344.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160787970a304c---pozipibepemigagugaxoxaza.pdfIn PDF document text
    • https://wangwangcamp.com/uploads//files/202108100826094399.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/vinebejipigogo.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/b70f989640c63d33dca082e09888fab5/58339208621.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l45i905oielbtil4jib15msg16/69124897604.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611480201ca87---rewabawok.pdfIn PDF document text
    • http://zuche0551.com/upload/file/73823502326.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/kmqqul0h1f7j3oph934miktuom/luzepagoderibobewifuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=soil+pollution+evs+project+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_off0000cf75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF75 10824 bytes
SHA-256: 5fbf2f08ed704cd06fc9131cb4c5ea081c5bc60f65ab4ffec85abfc00babcb60
font_01_sfnt_off0000e880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE880 17616 bytes
SHA-256: d605ed045ba85d88a7d0c176a79e85a4dc1b08600cb7e6e2fe1ed0cfd0bc2636
font_02_sfnt_off000115a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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