Malicious PDF — malware analysis report

Static analysis result for SHA-256 01304800b94c55c3…

MALICIOUS

PDF

86.9 KB Created: 2021-09-15 15:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9c2afe03413b30f216980980480de0da SHA-1: 3f05f4075144afb3bb6bdea241f1cf5d9b255d8f SHA-256: 01304800b94c55c3716b9ef91c5c0f9989d58af6d511cc97c844cb4c8d961d83
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links pointing to disposable hosting and compromised CMS upload storage, indicative of a link farm designed to distribute files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with a phishing lure attempting to trick users into downloading unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lednotice.com/userData/board/file/48090980931.pdf In PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/lasazavuboromolojajata.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/85787430283.pdfIn PDF document text
    • http://spharma.ua/files/file/59809743585.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905143312693353.pdfIn PDF document text
    • http://lixupeng.com/uploads/files/tidiledapudixigumajawokov.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161416d62eed20---sefanarigufil.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/fuvuz.pdfIn PDF document text
    • http://kppzp.pl/userfiles/file/23120539647.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/15196915451.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405173c6ba6---tujemibi.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/99142328663.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1cr3so4865vo5lbgot1jstpt3l/84050631862.pdfIn PDF document text
    • http://knx-shop.ru/admin/ckfinder/userfiles/files/tebajumex.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/47342238825.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/4979444156.pdfIn PDF document text
    • http://eltdb.com/UserFiles/files/40235246631.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/4798309345.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/bigajebotimoxikud.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/pafudadolisu.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/wulunibuwigunepogasopi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614073886bc6f---vefutokokokebinapup.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/dixiwuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=download+cooking+madness+apkPDF 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_off0000eac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC4 19244 bytes
SHA-256: c16bdae5a52725cfc12a9e50e82b64efba57e4cc159b60278c521343fafe822f
font_01_sfnt_off00011cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF3 10836 bytes
SHA-256: 193f9b91eccba1069c94d5013d876edb22887d348629a724af9829155a84ce60
font_02_sfnt_off000135c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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