Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ccad9e3b7d57f6e…

MALICIOUS

PDF

86.8 KB Created: 2021-09-07 12:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 54f47b34bc4e70c23b288d39039a8718 SHA-1: fcb2866885760f3400577435c2f95df6fcd0cf5f SHA-256: 4ccad9e3b7d57f6e6db5a0ebfc01d676500e930324d3088a50e26d9e3dc6f22c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is unreadable, but the presence of many external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://lutechmed.com/Images_upload/files/kugotilanebigoxenomezi.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/v4umvtf4gum0bn93a56orv93p4/99331219771.pdfIn PDF document text
    • http://sport-way.ru/img/file/lojuxuvoxemo.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/22346410183.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a387d647daa---fumopusazakowa.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774ac961c4---fadubaromozep.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/13116034162.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/uuc3n4r99c8co5frheup8g18ec/2572771165.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/1jbbhao0hki87tv341ggooqnr1/60298405550.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/jijitevewimemujejukezew.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/364837bc0e49f4ab1c59152c09e3d12e/93374554708.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/81c74ae91e6c6aceb06e54d6639752c9/98163853798.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021052202300773499.pdfIn PDF document text
    • http://palami.by/images/file/vurepufemuzogedolesofusur.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/rotapabaninatajogowewis.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/39159649246.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/lamebed.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/3f53531e3e932b15e832a00ab9264f3d/jakoxanotajiv.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/55944469770.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/636sn01u2dnp404gmavbe3a387/sogosofaxutuligegovesepuw.pdfIn PDF document text
    • http://alkanboya.com/files/file///naselegen.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/wuposolomuw.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/38781350026.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/zatuledujomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=manual+gear+knobPDF 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_off0000efa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA4 17900 bytes
SHA-256: 2e8867ddaf5410c126b0cdb7c8585400021f30b4a28fc910600d688465d6b6b7
font_01_sfnt_off00011e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E39 10248 bytes
SHA-256: cc3675369336f78d29b65ef1d470064cffe6b30f6e61c3581f7a3299e785f716
font_02_sfnt_off00013558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13558 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1