Malicious PDF — malware analysis report

Static analysis result for SHA-256 af09bb55c4df8924…

MALICIOUS

PDF

100.3 KB Created: 2021-09-04 23:21:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d1b216a15d067ab2f1b16e9690029834 SHA-1: 8034799b9e798ec4daf8d4f8fe5c36928e410b5e SHA-256: af09bb55c4df89248565943d3bb68e2524f2e97567113a9b581267ed34bfaeb4
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links suggest it functions as a link farm to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/72ea1d6a628e48ddfc9fd6c1e4d7e457/sarotijezomenag.pdf In PDF document text
    • http://kimsanghun.com/upload/userfiles/file/2021827723534443.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/sagf78mkachv9rja9ggg1uuckh/95804084983.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6504b52b861d347b69b3444fa7cdfde2/bubizovuja.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/jtlmsbcjae2s596neshjb4hhu0/85862063415.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad336e9f886---fofawave.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/guvuji.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1478260394---84544390271.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/eab93uco2cqq4l6vn6t50uv5g2/sijab.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/wuxipoxokupetuzigi.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710442393e3---saboxafadapazanumekir.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/94269268539.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8d5e93adcd5f9efa922fa930951492d3/bazoteropegasejo.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ona9vkl160rtv5gkf35lh1hb40/rebokanofuwubuwujekejan.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098375915632---jivan.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/woxowigudev.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/b871fdbbcca5e948cac5407745f741a1/sefawatewira.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/dedoriniduximulagevub.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/71657462084.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/75788672639.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb359f00ee---fedevalebujabefo.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/70526552082.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcfa61cbde---sorazab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=pentax+k1+mark+2+manualPDF 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_off00011e8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136A2 10356 bytes
SHA-256: 7b892e5b36aa262bd62580d6e44cffa4fb425bb80d8775ee95cfb78af44cd131
font_02_sfnt_off00014e1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E1B 20476 bytes
SHA-256: de03c802799384b3e251122fb5f0ec23da4cfd185682d0bc59c034dac5bfdde0

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