Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e0341286f37c38…

MALICIOUS

PDF

80.0 KB Created: 2021-09-22 19:42:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29c057a0c113a29b7ca70bc046cacd3d SHA-1: debb8aa3a900b03c9a7b1454de32b98f5fbf38ee SHA-256: 33e0341286f37c380c4324f1bd78572703f8afabdbe02bcbcfd42d375c39413b
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF link farm heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://tndgdemo2.com/ckfinder/userfiles/files/98175241274.pdf
    • http://geodez.com/pliki/file/niriwowajufigel.pdf
    • https://servicepapik.ro/files/48707625312.pdf
    • http://gkz-crimea.ru/userfiles/file/94593587684.pdf
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/36785720198.pdf
    • https://computerzone.pk/file/49017290256.pdf
    • http://trungnguyenjsc.vn/uploads/image/files/6389679587.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161478cac5e214---78040724041.pdf
    • https://pmrmhss.com/userfiles/file/pokiwopudiv.pdf
    • http://www.hon-ro.hu/userfiles/files/pexozularonukukexukojikas.pdf
    • https://suma.ca/upload/editor/file/tojokefirupadumote.pdf
    • https://halkapsikoloji.net/userfiles/file/58649507867.pdf
    • http://benevolo.it/userfiles/files/gogedataxamavufu.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/72834727444.pdf
    • http://movitecnic.com/ressource/site-image/files/78032428328.pdf
    • https://vos-web.nl/userfiles/file/64388119669.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161345bde9afcf---rusetijigamosur.pdf
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16149d6a5082aa---22491115411.pdf
    • http://constantemail.com/userfiles/file/163045350148272822393.pdf
    • http://fujieshubao.com/zk/UploadFile/file/2021090113035073499.pdf
    • https://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/bevupadalowipobibimajewe.pdf
    • https://paymentor.nl/uploads/file/jopivodi.pdf
    • https://afmiletisim.com/resimler/files/wavuxanelefavike.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pokemon+3ds+randomizer+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1ae.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 16792 bytes
font_01_sfnt_off0000e9c5.bin
2883fa172632dd783a5db84d715c388a0805b70076cd32338f85f4666575642c
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C5 10720 bytes
font_02_sfnt_off00010279.bin
ca9af89a8ad2d34a70508f67ea73b0e5f08cc06b0bf00650eca391fb07e86d4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 18500 bytes