Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b3385e431e78e9…

MALICIOUS

PDF

74.8 KB Created: 2021-09-09 15:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d97396b8e8ef256dcee4f8e1a625cd3 SHA-1: ec591c902e385bc1e524fe2f74bd23deb98421e3 SHA-256: e0b3385e431e78e9ddd250e8528c7e2e666514b2d52d6305c5ef6dfecd2010f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • 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.
  • 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://cructi.ru/uplcv?utm_term=mod+apk+clash+of+clans+online PDF link annotation
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136bad65c66d---53473119719.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/wezudedax.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/cf8e0c2bqo19dg0fv14jb75aq2/62965960126.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/faxoza.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/mezon.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/kavewir.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/keresunigebuzoraravizanu.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/d867c853g2rhr9crefn29s5vid/memoxoriledogos.pdfIn PDF document text
    • https://miet.hu/kepek/nufakopagutu.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/73949076824.pdfIn PDF document text
    • http://xn--80aantfcaehjbxzf1m.xn--p1ai/userfiles/file/91704395054.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/29836068735.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/13608906384.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/59887743793.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/lakev.pdfIn PDF document text
    • http://china-zub.ru/userfiles/file/sugekexumidalexipitevo.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/43404960293.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/9852543900.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/37417073659.pdfIn PDF document text
    • https://vhssirimpanam.org/ckfinder/userfiles/files/69931084320.pdfIn PDF document text
    • http://jiji.pgo.tw/pic/uploads/files/47068573955.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/65582980542.pdfIn PDF document text
    • http://fourfoods.com/images/files/rudezomexev.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_off0000c532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC532 15900 bytes
SHA-256: 1d8002ee58fd82170eb8ff98e6c65e831db49e43e4ca7c0dc969fbe1d3adecc0
font_01_sfnt_off0000ed90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED90 10604 bytes
SHA-256: 77882811d8ec440261a88a5cf563e10f5a878b44ce31e819487804f19dbb518c
font_02_sfnt_off000105b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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