Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05de897eda66327…

MALICIOUS

PDF

85.3 KB Created: 2021-07-18 04:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8fd1ac20c9893d87bd919a80aa83ab61 SHA-1: 23b78e8331b7c56d6742cb54942d3f00ab493bf7 SHA-256: c05de897eda66327a9d0ea73f471a4add6fc78cbb043cf09ace60664838b5b73
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content or phishing pages, consistent with a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/84kbusdnq5185ctiilnrfpfn94/vitafabapasubojoxiboz.pdf In PDF document text
    • https://acgroupenterprise.com/userfiles/file/nijoze.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a212f543b7e---sakefovurajobipib.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/nezeweg.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160f00c20a02b6---93371466134.pdfIn PDF document text
    • http://nicolalazzarotto.com/userfiles/files/zusuwadetadowirisonobujo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/75b808cf8f8b99c3eba3e7250d509aa1/61007294913.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/6475412262.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8b3fafc83---taxofotogivuvamugadolo.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c219c99c0a5---45606553112.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/jonawewuwixenipo.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/33041573174.pdfIn PDF document text
    • http://zuche0551.com/upload/file/5466001133.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665cba2e2e---kisatenumub.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/82893191912.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/75471607986.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/tapudaxuzilelukodaxarebag.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b6d8ba120e1b373ef8b23626145cac23/77215485159.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/migepaxamin.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/be87847fc14fdb00762e551dd2dd27ae/97013913603.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/xokovubafu.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/6057d42299b0b11f2f7f283076a2fe23/32571699338.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/tibomojapujebud.pdfIn PDF document text
    • http://sieuthibongda.net/ckfinder/userfiles/files/nejamunuzoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=list+of+triangle+theoremsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 10620 bytes
SHA-256: 7bbfe4c61bca42a23cda4c6a26dad255ec3b5efc071ac3d8c666d36ab8eeb5bb
font_02_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 17420 bytes
SHA-256: b04153d96e2d77561d757e6e7e7d8ce0ebd8208d73f2b19dac198489a0ccc2a0
font_03_sfnt_off00013254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 16168 bytes
SHA-256: 34837fdfed7e6dc9e8c1ebc45eabef1064a6e89f8cd536305124148a4af1fb29

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