Malicious PDF — malware analysis report

Static analysis result for SHA-256 5280da2d393ef35e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 15:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a4016677469bcc5004b8313a312e5c7a SHA-1: 90500daf95caa2b81b803f5250395d68009d1613 SHA-256: 5280da2d393ef35e2ff660c580244b8e6e196e1abb96e952b398fbf8185b4305
164 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. The numerous external links, many hosted on compromised CMS uploads, suggest a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature, indicating it likely serves as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://ketchas.ru/uplcv?utm_term=como+instalar+la+ultima+version+de+android+en+mi+celular PDF link annotation
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16144df1a137b1---39896783548.pdfIn PDF document text
    • http://articolo17.it/siti/usr/foto/files/43818856703.pdfIn PDF document text
    • http://hongdacable.com/d/files/mizoketo.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/sepanivojovuweta.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614414ab07f8c---90024955335.pdfIn PDF document text
    • http://smirna.pl/files/file/bepot.pdfIn PDF document text
    • http://totoumi.jp/upload/file/22705960385.pdfIn PDF document text
    • http://parilka.by/var/upload/file/nolomotiwabaxu.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/895eceacc85d947b215b3d5dd86997e3/8225267861.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/64863053937.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/gerevekilomaraweziduwuw.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/sikosaxesofoxizubawoja.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/55598554767.pdfIn PDF document text
    • http://boschvietnam.com/files/usersfiles/files/79250261982.pdfIn PDF document text
    • https://isleo.com/i_photos/file/dowetixelupotunawi.pdfIn PDF document text
    • http://naszemotyle.natura2000.pl/imgturysta/files/94284200144.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906122720535841.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/vataziduronegewut.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/91465997934.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/72879982878.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/35025080275.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/43124282384.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903011915.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/ripelewazobuxi.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_off0000d454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD454 10728 bytes
SHA-256: eb2bf121b933ea9a99cd52cdd337a0a7814f2ecb44f149da316af51b20615e38
font_01_sfnt_off0000ed02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10514 18596 bytes
SHA-256: 1f642c9c1e6f810cfe8adddbcc3772ee6aec9e107c84d36d225a0a638d229f6e

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