Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc6550fba2f5f59…

MALICIOUS

PDF

95.0 KB Created: 2021-09-18 09:14:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c71c8791fa08e4289fea81a23af1b639 SHA-1: 4d82a8b72ed050ffb2b18d3914d677835d2c8d47 SHA-256: 8fc6550fba2f5f59756fcac6f0cbcf1633a77e100f7042727d773c83a25f5b42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a link farm pointing to various PDF files hosted on potentially compromised or disposable domains. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further downloads or compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://topp.pl/_topp/file/73920229465.pdf In PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210913_025904.pdfIn PDF document text
    • http://zhongyuemedia.com/filespath/files/20210915160607.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/nupiza.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/jusujimoxumupowupolejusor.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210908_054636.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/buzezenijob.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/72357188654.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/14529421308.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/dewokuvedaj.pdfIn PDF document text
    • http://ondamarinarest.com/upload/files/rimagixonop.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/zegej.pdfIn PDF document text
    • https://sikdercollegeofpharmacy.com/scp/ckfinder/uploads/userfiles/files/bewizu.pdfIn PDF document text
    • http://hizirferforje.com/admin/fckeditor/editor/images/file/50610768626.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f30c2444ef---lupimivuliz.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/d9fee2bdd3bc5c2c4c89a03cba992be7/lizigusujokowureb.pdfIn PDF document text
    • https://liftsystems.ro/LiftFiles/file/51321107813.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/63845088656.pdfIn PDF document text
    • http://maturitni-ples.eu/UserFiles/File/75424672675.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/16266747146.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c96c39ff33---rasotin.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/sajuxapijepupuvekusuveziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=free+download+raft+survival+for+androidPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14C 23768 bytes
SHA-256: 203847e331cd71c9a1bfa7fe4c8899c79d297b1deff638d359edb98f2b61101f
font_01_sfnt_off00011eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EEF 10576 bytes
SHA-256: 962ef9022762b2378f13c5e03353c5f0b5bd72af9422f83a937104aa7e8b2132
font_02_sfnt_off00013738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13738 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off00014d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00016533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16533 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105

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