Malicious PDF — malware analysis report

Static analysis result for SHA-256 713084693efe1ada…

MALICIOUS

PDF

74.0 KB Created: 2021-10-02 02:48:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2761f04917ce544e23dfd9749d3c0528 SHA-1: 1231f4083472f59f76bc288718cfb7a0a96f474b SHA-256: 713084693efe1adabc1c96db77461ca5e28b68af1e7d2770bec0844b0b3a7a36
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics fired, including PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM, pointing to a link farm strategy. The embedded links likely lead to phishing sites or further malware downloads, consistent with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://zsdbiopharm.com/upload/files/tirilazitatanoj.pdf In PDF document text
    • http://ssatripoli.org/userfiles/file/24276615270.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/g3pobvinvm1utkqutvmdn5duhb/22371595271.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/duvagar.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/retutedexewagur.pdfIn PDF document text
    • http://cross-winds.in/upload/contents/images/images/surememexatagivizovezuni.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/62264334200.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/82603178322.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/vevuvikofuvalavojikifosif.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/tavisu.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/83389450474.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/gesowirenidopixaju.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/0f14f2f9b32def0445bfc19a180ea52a/1180706023.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/redepebusanobedopaxi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/18d794d4002909c3980469fcd72da18b/gidemipax.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/51850745603.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/gukalixopir.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/80995931864.pdfIn PDF document text
    • http://pk.mo/userfiles/file/57413920193.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/zofekowa.pdfIn PDF document text
    • https://rhuyscampingcar.fr/images/files/34272517725.pdfIn PDF document text
    • https://llbyggodesign.se/UserFiles/files/zemabejufofakezoz.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613393f909384---62509622950.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder/userfiles/files/30936632219.pdfIn PDF document text
    • http://cameralehiep.com/hinhanh_fckeditor/file/bofisesenunezibekowukuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=install+alongside+windowsPDF 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_off0000ba5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA5B 18944 bytes
SHA-256: 134409a77921250d5d43f8e3941650af3c05b7e2a94c8c25c54dd5aa3f79d514
font_01_sfnt_off0000eab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CE 10360 bytes
SHA-256: d1228fa93a842a8f5e9300705a69aedf1e95e0466507e50e7035241d87a493c3

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