Malicious PDF — malware analysis report

Static analysis result for SHA-256 1968300b66271c40…

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 03:33:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f0e032c31e976fb9cc90d44a537e5ddb SHA-1: 8a5113e6d07a6644fd929e98dfc54a51c19d5be7 SHA-256: 1968300b66271c40aaa253db7f10c83d67b758df68d563568336b1db3e0f00f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a ML classifier and ClamAV, as malicious. It contains a link farm pointing to numerous compromised WordPress sites, suggesting an attempt to distribute malicious content or phish users. While no scripts were explicitly extracted, the PDF structure and link farm indicate a likely intent to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/978e247332382a9151c72c2f17a912c0/pilugatulojatezojepikem.pdf In PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/eff598cf9929c61d1bb01bb8e3c49c2b/duxugagumizepajoges.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/bd750a8b174b22b393cf35944622da0e/jelovamosajexaluravan.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/deaa2651ee3539c7d7ab2d73eb707202/nafatanovolisalidoj.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/q3mncop0fillbhnqtdon3e459b/nusasojikobawilura.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609edd8ba0102---94547082254.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/rapudusivi.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/70ad45b34812e1665ffa40bd9767bcdb/fonixawevonifutu.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c02db18cf14---suwidomejalin.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/57724996612.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/zulebutosenefofajopumis.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/f554579183f39a6e2fbcf02ce0845531/kewirinexupofosu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c77bc3cca2ce3ea9bb0b026500215daf/36029594485.pdfIn PDF document text
    • http://bliznacite.com/files/sikinebuvoxovobuzutuwaxo.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/nasaresavoresigedexesa.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/61423736463.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160923eb6ca936---lapezupexopajozalefer.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/98087420466.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/60415790611.pdfIn PDF document text
    • http://biotledlight.com/userfiles/file///tuwikupopogoxupoka.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/8f93be229cf2bb52bcbc959708e9a0cc/jowuxub.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085562da43f4---bogulemodikuwebek.pdfIn PDF document text
    • http://nprofit.hk/userfiles/zanewexuxuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=mozart+for+babiesPDF 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_off0000f41a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41A 16844 bytes
SHA-256: 012fc59a3dbf4a01926d25bb0dbd9bd4803ec553380c8bb365e6df9fec996187
font_01_sfnt_off00011f96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 10248 bytes
SHA-256: af46be3178b040413b91a67e483541f0dd6a334da9e1cb63a68f5ed62635bbf0

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