Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a7280efcdae1f6…

MALICIOUS

PDF

70.6 KB Created: 2021-09-01 16:51:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b21df8065c44561c732d8add807eefb8 SHA-1: f3f2847e8742501da36021a4ce744c6da0c3e3b1 SHA-256: 54a7280efcdae1f68897d525826c2ef4ec49bfc13a2a06f0056fc2746fd5d46d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains a significant number of links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The presence of embedded JavaScript, flagged by heuristics, suggests potential for malicious actions like redirection or payload delivery. ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://imailbox.nl/images/uploadedimages/file/gaverorozawepilepif.pdf In PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863d362ada2---tixepogomaremivu.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cf473907a8f---31964986945.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/abjf32rickiab0ncfit12nbek7/40930592814.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1621256141.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a480f371680---70628957678.pdfIn PDF document text
    • http://grandrosso.com/js/upload/files/kafutakedujomanunurap.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eb351c8fab---sovitajagowotenunisujena.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1610da23e3701d---40714510243.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/83d22c74de49ccd2ecace1b3e58794e8/92374140520.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/mixisevesomogiduxipig.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/9894d14e440ef88c325b0ab782f20459/masufusulanexes.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/degujotisexigawusejixob.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/75592027132.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/15247809570.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/49532936913.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071c40768377---19581513550.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/sisega.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/8ceaf4f6153c7a788d909e62d23a7dce/jujenekanev.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d3bf6cb13---kenaje.pdfIn PDF document text
    • https://xn--z4qq44i.tw/upload/actfiles/59944610155.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6695f0af12---senerobinoguxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=conditional+independence+formulaPDF 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_off0000b3e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E6 10744 bytes
SHA-256: 22ea46f882a2f1c1b2e1a725877a11e05a2dd08e2b9c3e0175fe4f10e621f88d
font_01_sfnt_off0000cc91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A3 15796 bytes
SHA-256: 350b40c416f782bce93205de741e6e553cf2f7df166dacf2e1aa04674c74a3b8

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