Malicious PDF — malware analysis report

Static analysis result for SHA-256 d204f9941554ebcc…

MALICIOUS

PDF

72.5 KB Created: 2021-09-22 12:36:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ee2466c7189308126930934608908eb8 SHA-1: 8ff0d2d7036520acf6d0a1a739caeba4c10ecc67 SHA-256: d204f9941554ebccf95cf0942b514aab4f11f961640d65edecf32cfa88fff597
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised or disposable hosting. The PDF likely serves as a lure to direct users to malicious sites, as evidenced by the numerous unknown URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The embedded JavaScript is likely used to facilitate the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.lsv-wittlage.de/ckfinder/userfiles/files/10029828322.pdf In PDF document text
    • https://junona.manyel.website/images/uploads/medium/12185501930.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/garaxiraluxi.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0227a7733b76025e6612b66a23c5aafc/69551879982.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/20575179112.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/16286103172.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/witonowekob.pdfIn PDF document text
    • https://1ar.sa/userfiles/file/lobiloloxogoref.pdfIn PDF document text
    • http://jfhcoaching.nl/userfiles/files/42603884233.pdfIn PDF document text
    • http://yachtandgulet.com/userfiles/file/jisemimaj.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/15603729146.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210903235434_7u8mcu.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f4f47c9cb4---55343824680.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/josagaze.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/werojuzilubejexafa.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/46462556370.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/25082345260.pdfIn PDF document text
    • http://youzedu.com/ckimages/files/20210906045153667965.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/a0mltfoe6nqkqdqt8s6l6smo9j/6721502501.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16140cd6fdbabc---4840878609.pdfIn PDF document text
    • http://quesnelbusinessnetwork.ca/userfiles/file/kamopafaxaseju.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/88293053643.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/lurodufivadojuvevonu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=build+block+craft+apkPDF 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_off0000b8eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD102 10596 bytes
SHA-256: b122882862a00b5b38dd2298007eb19a66791b942984dfa2e27a51225e92ebfd
font_02_sfnt_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 16620 bytes
SHA-256: 53f6333dd6ebfd90b900ac3767b848dcb42ec225e49aab2e4bf5bb970e6cef3c

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