Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a341c223092d4a…

MALICIOUS

PDF

77.1 KB Created: 2021-06-29 18:42:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e339fcb9ef9bdb959567ecf4ba28be40 SHA-1: 8d9ca52efd2881456d8139e6c784389a459b8d52 SHA-256: 58a341c223092d4affc151eb78af7a14d1cde3cb5bf237640db76e4aad16525f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS upload directories, suggesting an attempt to distribute malicious content or conduct phishing. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics indicates a focus on directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://12tiga.com/contents//files/vozodabiri.pdf In PDF document text
    • https://ivanamihic.com//files/32825389024.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vpgttv75shr8q0tkqqeqcr8c54/wijusafeminojuxopewat.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/46306922865.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/19g9e8vtgt1q7s9n1glphp6rf7/44556326005.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/pivesabazabovazegafu.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16091891a95cd4---jewogisalotozixiguvifunus.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/33239545433.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/1j8put3for38gijutgpnbc4ht3/dukosatutunavuvipu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608df420476f3---zawapa.pdfIn PDF document text
    • http://benjamin1908.com/clients/f/f4/f4560e3fe432b95d15e234f900dec36a/File/vogetusalujiwetag.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c0d464967a---35064315828.pdfIn PDF document text
    • https://icbacademy.com/upload/files/jixewiwujopugowilujunulem.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/0313f392f050308d33df653e4c66bd9a/tedubefop.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160c46be9e509e---zinimofaxegiw.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/5384eedc036e77a96ac63cdaf3e492f6/firumabudefupibufix.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/798a0d4e71f833e6b73d6ab2fcef221e/veladosawenerimadi.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/9vs3vbjf0tag2pavv9vusrcej7/50036571756.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/kowexekumani.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/154a18e4ad27d7422dec2b051e9fb062/figonovepesopovazivonu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f2db89697686985e4215f7e054c8cdf6/79715702546.pdfIn PDF document text
    • http://kunas.lt/app/webroot/uploads/files/dawugikaralumo.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/6604b8c7fff3746a2271d728f50ba21e/lozufesafidotizo.pdfIn PDF document text
    • http://pk.mo/userfiles/file/54911470564.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/7f982377d7a332b0f09069bc601c9336/daxevi.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/fomegexijawexinanuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=pd+sharma+ecology+and+environment+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_off0000c97c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97C 17068 bytes
SHA-256: d461a5fec67526d7a698752ee2b0b172b240b0db7aa996d122bc813bf7183db6
font_01_sfnt_off0000f4db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF2 11248 bytes
SHA-256: bcbb7ece4c937d7b22ae52f5902a97ff8bb84d21b0811b0811790554bd53f503

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