Malicious PDF — malware analysis report

Static analysis result for SHA-256 a07d015d9bf5c083…

MALICIOUS

PDF

83.0 KB Created: 2021-08-26 14:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9a90b5988c24cae1140a123aa7572088 SHA-1: 0c245a1975af16182aaa0431f5ee3f25ecf67e84 SHA-256: a07d015d9bf5c0835e17283e8dda34b09458cc03075595c64209c3e3521bb99c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and a large number of external links, many pointing to compromised CMS uploads or disposable hosting, suggesting an attempt to redirect users to malicious sites or download further payloads. The presence of embedded JavaScript indicates an intent to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://smidgel.ru/uplcv?utm_term=how+long+should+you+let+your+puppy+cry PDF link annotation
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d3a3f48497---78209263974.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/78665864097.pdfIn PDF document text
    • https://heyratacademy.ir/file/77983693248.pdfIn PDF document text
    • http://hit-air.pro/ckfinder/userfiles/files/84583710622.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608549e35a16c---munukevevivofo.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/161170ada7c112---45177822461.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/pepebanivewabaputowof.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/niroxikimurula.pdfIn PDF document text
    • http://kme-kme.cz/files/file/bibowujadumezepasurasum.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160f7166ade8a3---nugebiwusi.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/55072256188.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090c3ce1083d---8133918329.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/lisosowa.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/bifevopiwe.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160824f5996ef7---kekoronifaba.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ca483d5b494---19351693997.pdfIn PDF document text
    • https://yildizwebpaket.com/calisma2/files/uploads/zugalowivupepekifiliwena.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/98689472854.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/54615113475.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1623457133.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2cb4c251e---fenimepixuvexeji.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078052f0825b---15115286949.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/lajezagomojozumu.pdfIn PDF document text
    • 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_off0000e4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FC 10832 bytes
SHA-256: d09b665cf99b9ddf8d6e6f40f40700c580b745f2651303e26dcfefecb6e19e36
font_01_sfnt_off0000fdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 15428 bytes
SHA-256: 7b3e67a51c208ac9efa65adfb65fd2276efa0cce4eb3a39213b009516bf8b3e2
font_02_sfnt_off00012506.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12506 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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