Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a838d6dc80de12f…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 00:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1099c01470ccdb56518ec4f726287eb5 SHA-1: 6772c8e894ea2e8d10d1e66994b194fa84cc099a SHA-256: 5a838d6dc80de12f7ae6dec60b34f1cde7ded4469653b5c11dacebf2d27d2bd3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a significant number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.sibirprokat.ru/ckfinder/userfiles/files/6386060743.pdf In PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca20d026dc---wifobiv.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/lerutodakena.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/jekesumizuzezeb.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/watozevarufutekalezuw.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/26021959741.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/raluxedun.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/labalitatemivovad.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a92414dc21dd51423071fd81bab289f2/55604597710.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3519a9b88c859c7c85b9fbe6a022c34c/66889376054.pdfIn PDF document text
    • http://alburigiott.it/userfiles/files/95261554465.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/dfrng97ochbg4031p9k5ik4ris/90006516761.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///71853375780.pdfIn PDF document text
    • https://windscrm.net/files/file/jegeviwinigorobi.pdfIn PDF document text
    • http://thecuriosityshot.com/jidof.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/85381619979.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/gapetapigevigisogesasi.pdfIn PDF document text
    • http://a2hgghk.handylover.com/upload/files/56237266743.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///88840067820.pdfIn PDF document text
    • http://investbuild.ru/var/upload/file/jumuvodukugasu.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/daliwiwixejel.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/jareso.pdfIn PDF document text
    • http://maulich.vn/attachment/files/pasulikefejap.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/xisokefilizenudi.pdfIn PDF document text
    • http://homesunshinepharma.com/upload/files/zomiwezafibudidiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+check+sim+card+capacity+on+androidPDF 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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 18592 bytes
SHA-256: 6f2592b048ca1dff0c4af36a543571132072cd619151cd57812104ddb514001e
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12604 11016 bytes
SHA-256: be5976e18d991a73b58543f82ebe08d0ffe498f127e124926584edac197aa7a2

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