Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e6e1686d542dae…

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 10:08:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 308de3a5f850d51bf3aa80f5efc9f205 SHA-1: 5097605277c6289ad6548f864fe8c84fdba3a20c SHA-256: a4e6e1686d542daeb85e4560a4f3e07c259f8bd4095a51c763d737ce7bc3553b
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating it is likely a phishing or trojan delivery mechanism. The document functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and disposable hosting, designed to redirect users to other malicious content. The presence of external URIs and link farms on potentially compromised or disposable domains strongly suggests an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://corpusbg.com/files/fck/file/19052741447.pdf In PDF document text
    • http://youngdongtec.com/userfiles/file/91509640921.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2429eb94a35c2bf8ec1b05c0d4619b2/fojejevavabovunutowuzinan.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/xavobebuwijolaridorurub.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/f0kdfrive754m7jepaq93na4e5/modilatababunaponixa.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/xifowenune.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/39341772920.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/42538560651.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613a75408f545---76040859005.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/96401118471.pdfIn PDF document text
    • http://hanasushichoice.com/uploads/files/pugorazelexil.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/wiwinoxosijen.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133723a70866---detusajafe.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/dijiwokopowowadebabevet.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/c720dd57e1ef01812c83f85ca04cd094/90919963022.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/72549393773.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/vuden.pdfIn PDF document text
    • https://hiroyoung.com/data/files/jopebagesivebufif.pdfIn PDF document text
    • http://archbot.pl/files/file/39339139295.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/kigivapuveketezid.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/zipumag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+make+textview+underline+in+android+in+xmlPDF link annotation
    • https://www.rt9.rspo.org/ckfinder/userfiles/files/kelumiwezazaravuz.pdfIn PDF document text
    • http://elezioni2014.gds.it/userfiles/file/66139890539.pdfIn PDF document text
    • 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_off0000ba29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD23B 16472 bytes
SHA-256: f2f20ba9533c4df91a887633aed390241143b2498e8fb9745ceff8052ed59745
font_02_sfnt_off0000fd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD23 10680 bytes
SHA-256: 72a11293f628e019567be430a01217777ed445be72708ac2604e3bb3146fdb81

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