Malicious PDF — malware analysis report

Static analysis result for SHA-256 767091571db1dc18…

MALICIOUS

PDF

74.8 KB Created: 2021-09-07 20:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e198e2877a2f8a8d55b6d44d103cb336 SHA-1: f5a5213ce201ee2e9cfa5b1576dc48c1b532a466 SHA-256: 767091571db1dc1864922b523af109f1a8d09d11129c091d8db327e340e75552
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to trick users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=kanji+in+context+pdf+download PDF link annotation
    • http://bvsaigonbinhduong.com/uploads/files/safivoxuwedepagaderu.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/74431364775.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/77952715645.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dml44drv5s9qb1gq6i7s8rui81/69984611576.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/tizenazeruposogilo.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b21432a366a---wupevisogatuko.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ebed24192---nedoliserevetaduf.pdfIn PDF document text
    • https://warungmimpishio.com/contents/files/xiwuzorevafeso.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/88907594232.pdfIn PDF document text
    • http://www.hcc-cpas.com/siteuploads/editorimg/file/dopafivudu.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/69058612864.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f02c237faa---vepunorig.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/88066755988.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/viwapuzutifagu.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e3e068c676---93914286484.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb0e57ab8---34726985244.pdfIn PDF document text
    • http://scmsalliance.com/clients/864514/File/vitizaseguxudenejubaxeme.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/4951807002.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/35672436446.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/82658915505.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/5f502hjdsvd4m4oul3hu4vvmjd/43891770154.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba212086bef---76755708622.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/xuwupalemoputigul.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_off0000c0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AA 17284 bytes
SHA-256: e9aa5b4db1f6472bd9e3bc4c0fbdd7d4dcdd65125aa6c8920c7cb04e579cce9a
font_01_sfnt_off0000ed28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED28 10652 bytes
SHA-256: 41e8034ea08c0ccf65f96bad1e5306544417708a7c697d39e01df81cbd97f5e8
font_02_sfnt_off000105b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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