Malicious PDF — malware analysis report

Static analysis result for SHA-256 973a11f943f8ccc8…

MALICIOUS

PDF

111.6 KB Created: 2021-09-05 01:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3b530403346efca6656fff502a847e8c SHA-1: 7943d6dc797c1e76e491e786950e3c2ccd19c5ac SHA-256: 973a11f943f8ccc8a64c7522ae0f11116e569263184595c3757c518db54c9fb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://blessingsngo.in/userfiles/files/55164038391.pdf In PDF document text
    • http://atsrealtyvietnam.com/upload/files/zivefugukuvokorosusu.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/44176954031.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/fapigomobixe.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/pibateb.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/5940739194.pdfIn PDF document text
    • http://galsabino.it/userfiles/files/sulogebojaditurebisove.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/0f97043f54e3899c72f000041b3a7157/ziwasiwinojo.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/62qj2m8di9i18ker5jqkumal29/lodagapawofok.pdfIn PDF document text
    • http://al-farh-iq.com/upload/userfiles/file/pugujekog.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/dixewixuwim.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/98450609960.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/36372352372.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf2d08221e1---fanetenope.pdfIn PDF document text
    • https://davnosti.ru/upload/33967323995.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/70153874185.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/h6ui36s7j7tvf1rnbj7flgqko4/safebanegubazomadeg.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/c32e84cbbb120de8e0b509bbcfb3e134/kowopos.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/13bffc6403c8d22a217daed80be3c726/nilipivomuti.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160839038269f8---wijetemijixod.pdfIn PDF document text
    • http://grandchainfamilyfoundation.org/clients/85333/File/nalimuvidomozawakejixas.pdfIn PDF document text
    • http://appartementslisa.it/an3_Uploads/file/modopunadojudepajowiweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=translatability+and+untranslatability+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_off00014b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B73 20960 bytes
SHA-256: f18e339c213390b82d7f3450712719b51150b4d52763b073d4585c62effe6b3c
font_01_sfnt_off000180a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000198b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198B9 10556 bytes
SHA-256: 8d6bc6ee83ee917ded36f3343bae1eca7d2480361f56ddf277cf1082128bcc87

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