Malicious PDF — malware analysis report

Static analysis result for SHA-256 401081811ee3d1b5…

MALICIOUS

PDF

70.1 KB Created: 2021-09-13 21:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: de42a932a59e26ba6199a5373d725d6a SHA-1: b1e2696846fd9d11ae89d97a93700c2b27bf8a4d SHA-256: 401081811ee3d1b5114dbcb5cce8d4ac1472306fc9f207b2cc001c92e6966b07
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm. These links are likely intended to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crescentcarpets.com/userfiles/file/titode.pdf In PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210905082125.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/32837140283.pdfIn PDF document text
    • http://thegioixedap.net/upload/files/kazekonixirozevasusanov.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/98228387379.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/4463837641.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/67968699086.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16137da08a7641---72708960183.pdfIn PDF document text
    • https://futurefacesmiami.com/uploads/file/49277790614.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/bosm9r24dao8k09106psauiern/60189914018.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210902_0553ABFFBA6D47D4.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136017c72494---45643437434.pdfIn PDF document text
    • http://mariangelesorrico.com/galeria/files/zosegesejitexut.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/44491568896.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8984109e---sazebew.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/46325193125.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/susadako.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2d85caecb---22190143274.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/78352019965.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/38914837491.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/sulixevidijufebu.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/kpa9tgahl0chmpb5a33uv9ocv2/rokobim.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/rakuserimosekoxilo.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/4490757748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=android+photo+taggingPDF 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_off0000b683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB683 14840 bytes
SHA-256: 1494dbd0269e4d660f0ea3dad669b0b1d1dc99d2787dd073a9ef56ef63c51f4e
font_01_sfnt_off0000dba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B7 10304 bytes
SHA-256: 5b4c8aa690101476602f9b653bb5bb4f42edd1a680276fecbb38d32d27ad7bb7

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