Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bdfd372338c5a2f…

MALICIOUS

PDF

126.1 KB Created: 2021-07-09 04:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f504a0b9787e78d403d7d9c86d626966 SHA-1: c70b067818881b947ff627ab2c9a9a2436d4391c SHA-256: 6bdfd372338c5a2f006ec45f80ff07bc7610c963fd1199bf13159693ad5133b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It hosts a large number of links, many pointing to compromised WordPress sites, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://synerhu.ru/uplcv?utm_term=slaughterhouse+five+about PDF link annotation
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e3a30c831---dopemoko.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a774f4134cc---29997604063.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f84b17524---gumolejevutetepipawu.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/koneduraka.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/dezomezulula.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adfea09fb51---3134255698.pdfIn PDF document text
    • http://sns.hu/_user/file/kekiresixef.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5cbd0fe7aa186b259b31d2fb70fd7cf7/bereropuda.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad5225a710---valilawalafid.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/sogopovilazap.pdfIn PDF document text
    • http://apcmagon.com/userfiles/44348858193.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/brv40b5134gp8vqan9j8vdr99u/16467632950.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/teveloxul.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715039034be---muxejepumuxotafel.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6ac1a6d85---38734867006.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210508201341.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/1501977882.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/zibuselufamem.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b09fa426e07---lamapisup.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608776a5bbd88---vujur.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607650eb7336e---nawoxunavala.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/d8f9f8d2350c7bc2d8c51aaf8be20302/18448373283.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_off000189f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A204 17896 bytes
SHA-256: d02423ff861c924c0aea894dbb3b3306b4c7863846f5ae2da1e8bf84c03eea42
font_02_sfnt_off0001d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D087 10768 bytes
SHA-256: ff6504952fa24e5b945cf6be1cc50a15ee8c7828f90a3d6484890b7b5b17d43a