Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce2d22c398a2502a…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 02:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e48cd248afe41290346aae1c8333e4f SHA-1: 28d3be4cc9d46414ad77aeae9c749ba15239bb2c SHA-256: ce2d22c398a2502a4f74e7bd64e1fe9d67dce222b8f045ff1d4545fcfda949bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to numerous compromised WordPress sites, hosting other PDFs. Heuristics indicate it's a link farm on disposable hosting, likely for phishing or malware distribution. ClamAV detected it as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. No scripts were extracted, but the structure suggests it's part of a larger malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16108488a1925f---webazolemeremefupojefe.pdf In PDF document text
    • https://maturana.cl/upload/file/zurusakojosokup.pdfIn PDF document text
    • http://www.leposeur.fr/site/upload/ckfinder/files/mipogiguzefa.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2319cfea6ce8895c5045b2588ff8e522/80417318608.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/527438a3e00876b0d3e258b7e6cf1d2c/guseluzejofu.pdfIn PDF document text
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/20a534cca4385a63604163200f022407/5585707137.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/39086518257.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1612ab144e7d9a---74064954881.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071d9c3478d1---80237790535.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/c0j85kq4e7pv84lqlt81k5av48/87838630680.pdfIn PDF document text
    • https://khanikango.in/file/totekakatovin.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/cvab9f1ug3u464p5a3931ei5vc/23946873388.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ad7109ed8eb---83167186512.pdfIn PDF document text
    • http://centronegozi.com/public/ritagavabu.pdfIn PDF document text
    • https://begili.com/uploads/image/files/59885288387.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210518210123.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e025414ca8b---kisaginubejamopurafoxuk.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/gutonoxufevitokajokex.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/69586480814.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/notolabetevojexom.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/kugajijutu.pdfIn PDF document text
    • http://leruichem.com/upload/files/86277022680.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=grammar+exercises+pdf+high+schoolPDF 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_off0000dbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40B 17864 bytes
SHA-256: 9b43f523042fe457d2216815c8a10d4266069db8da81d951b2e2af1ea2c71935
font_02_sfnt_off000121d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D8 11008 bytes
SHA-256: bd8e97f8e3e83c77294a209db36a386ca2e15a8f71747434cdea0d330c6c2b30

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