Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa6969b85fbc14c…

MALICIOUS

PDF

71.4 KB Created: 2021-09-19 14:07:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a91bcbaec894d3fd5cd48ed6f94c5bbd SHA-1: bca732833fc9b5382e159055995e4a2a49651e2a SHA-256: eaa6969b85fbc14c57a0ac9d714fd4476fb641f896dafc38029d7089855f1129
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to PDF files hosted on various domains, many of which are flagged as potentially compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable binary data, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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://moriefrusca.com/userfiles/files/32192857028.pdf In PDF document text
    • https://mebelihome.ru/upload_picture/39110078864.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/46053195496.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/59895133793.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109130130083458.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/24184230866.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/mivukanukagive.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/jetemikadejukegamofoba.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff05b8aa99---20622899369.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/rikesula.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/17835600661.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/panimurirube.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0189a6552---45994080618.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/58796804485.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613f066342880---39746982714.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/bapijokomalogebofutenobi.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137e6dedda28---zujukamig.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/lamudes.pdfIn PDF document text
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/77201175466.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/57064501648.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210904054430_y37pyu.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/72548259956.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/vimusumavatovaduwexaref.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=android+porting+cameraPDF 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 extracted file (font_00_sfnt_off0000b59d.bin)
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn extracted file (font_00_sfnt_off0000b59d.bin)

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59D 16532 bytes
SHA-256: 5b62fba5190e8d751dd652009158d7d06104414f1962a54912d61fa5b4643f29
font_01_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF827 10624 bytes
SHA-256: 0cf4cdb466f062269a162ab93941dbf5fb5b52f3f601582a277ab6e0808702dc

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