Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d95981b6f2f1c2…

MALICIOUS

PDF

87.0 KB Created: 2021-08-26 01:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 82b975aa60dbf529cfbae6f7e0742364 SHA-1: a07c573a0383bc1d26d14f84ca7540aa6e9301f6 SHA-256: b4d95981b6f2f1c24cf431b3064bb3d660baff91a93d9490a2dbd5b50bf7eeb0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://adamlegal.com/userfiles/file/39264635665.pdf In PDF document text
    • http://petukmahaaaraj.com/userfiles/file/mezedenunobise.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a9b9faa2c6---6159092218.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/cggmue5m3h9bk95omi1bun0662/dowoba.pdfIn PDF document text
    • http://tatvideo.ru/ckfinder/userfiles/files/fuwavu.pdfIn PDF document text
    • https://webmenuplus.com/images/file/kiwewasifobu.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/jowaboxugoxozub.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/38056638211.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1610adffe69e2b---56394627186.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bf29a81fc09---judasipo.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/n4rq6rmnk9k1kojatkeipd94b3/feradabav.pdfIn PDF document text
    • https://www.explosivo.gr/wp-content/plugins/super-forms/uploads/php/files/d6ecdd434ba3337481f75e36d99b9333/xenuwamadoluvirabesesipe.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cba8edf95---fanotekonibulopukamere.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/jokogidako.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/3616e9cb9fab6cabbcf89a0e07bb30fe/mimosepu.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210708141633123.pdfIn PDF document text
    • http://www.moyekolodin.com/files/ponosus.pdfIn PDF document text
    • https://luminex.pl/upload/file/59805322248.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/49577432926.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/50a1c6d3a189810c5cb90f141bd25cd5/51531499357.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080520fa83d5---pexuxadiliwilufuse.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1bbbda6fffd4e96861a643ad40851473/mafobax.pdfIn PDF document text
    • http://emrc.ie/upload/imagecontent/file/gunonik.pdfIn PDF document text
    • http://asustainable.com/global/file/puninomekitewafago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+gym+workout+for+footballersPDF 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_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 17152 bytes
SHA-256: db863a101187e3912435f3f2b4123354d13491296df258ae87648e34a57b6f9c
font_01_sfnt_off00011cbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000134d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D4 10948 bytes
SHA-256: ba96b1b94594cf2941820594b0d50cc3588ab0b46b79387d8821eaeca1a555b8

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