Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9a281f8df7fe7c4…

MALICIOUS

PDF

93.0 KB Created: 2021-09-05 08:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c5df0e49eeb3ab659a5bcba496f58c00 SHA-1: 73e0fb8eaac0dacc8264d82f34b83a00c4868424 SHA-256: c9a281f8df7fe7c4b9eb6c86e80b088ef87927eb49fbd4777a29007ecd61bfed
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed to redirect users to malicious content. The presence of a QR code lure and download button phrases further supports the attack pattern of tricking users into downloading or accessing malicious resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1955f9b3---digewewimeba.pdf In PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/2arkuqqcgh8n4n9hnimu8nt3r1/rujunafexadedididogu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/103sojkq0pr96dlk1o3ij71vmg/risigegetirerukop.pdfIn PDF document text
    • http://veiligheidsslot.nl/ckfinder/userfiles/files/kegevetejam.pdfIn PDF document text
    • http://khmer24biz.com/public_image/alluserimages/files/44557719602.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/25261549398.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/88206139325.pdfIn PDF document text
    • http://lawrence-spruill.com/clients/42275/File/50808368593.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e598c62634---9071186292.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcf406c4b---sufizeliw.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755da658bc0---nuziwufa.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c53d11870a---niwan.pdfIn PDF document text
    • http://decaiyun.com/upload/file/2107132029047248435hh0ylwfcn8r.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/19r3g3onkid52esme1ba6hg9r3/puluxalozetavifutes.pdfIn PDF document text
    • https://bettyloupaints.com/userfiles/files/bivilinavoralewipix.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070dda7789c0---gisikamifijupebodu.pdfIn PDF document text
    • http://skolky.info/foto/images/file/14512909543.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/sosumewolagilizejabuk.pdfIn PDF document text
    • http://tlumacz-bialystok.pl/pliki/file/25169496794.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075d4f7200ae---13180877270.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/91312117193.pdfIn PDF document text
    • http://csc0851.com/userfiles/file/20210626131846_7s6oyy.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/8040142603.pdfIn PDF document text
    • http://celcg.pl/uploaded/file/90320120949.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=ios+scanner+app+pdfPDF 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_off00010743.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10743 18280 bytes
SHA-256: 9c49e90370fa127c04410becbf81c86465711cf789b17100af3e6d43ffb23868
font_01_sfnt_off000136dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014ef3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF3 10328 bytes
SHA-256: 652bc3e1f7410b8b3bcc2076f30e085f91d38c9863cc6540c07141a45eaf5e76

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