Malicious PDF — malware analysis report

Static analysis result for SHA-256 a419dcdc0c4c8fd0…

MALICIOUS

PDF

149.1 KB Created: 2021-09-08 01:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c452bc44de424f5e19cfde483dfd9fb7 SHA-1: 71d2a023b6fb2eb0f50404142c8cf2b15ce7bbde SHA-256: a419dcdc0c4c8fd05b7a2b3707311182c50417cd9e78c217f640e545d32c00c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9246

Heuristics 6

  • 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.
  • 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://communeouchamps.fr/userfiles/file/pabemalagerupajigeligu.pdf In PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/46112756464.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/63130546138.pdfIn PDF document text
    • http://berbun.com/user_img/file/tagil.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/53145655109.pdfIn PDF document text
    • http://sure2trips.com/bot/ckfinder/uf/files/38658448084.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d990295cd5---83631750893.pdfIn PDF document text
    • http://2021woods.com/clients/b/b0/b0e6999751250b7f6f06d89f33415bdd/File/8478974776.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/lits0qvnv57hog0kp4bj8t7qkd/wemebifu.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbfbb8e0b00---82941284650.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/68298588065.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/jupodajeviguvur.pdfIn PDF document text
    • https://okazdedziecko.pl/_files/Media/file/75945269300.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/25hn3jkkpb27he7miol3v05q9h/95816284574.pdfIn PDF document text
    • http://coverybox.box8websites.com/ckfinder/userfiles/files/27616401123.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/nirofowatatiga.pdfIn PDF document text
    • http://hosteleriayvending.com//ckfinder/userfiles/files/12850369038.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0052d6d645---tamafe.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/lozuvun.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021050106584566.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/74c10325ffdb33769398a976ea52711e/munavinemumudebebozu.pdfIn PDF document text
    • https://cleaner.pl/userfiles/file/16857803066.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/42808254940.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/jisemesoramufofojakoril.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d87cc6ec85---pirebowu.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/dufavudezukejimipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fiscalit%C3%A9+internationale+pdfPDF link annotation
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cbb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CBB3 1684 bytes
SHA-256: 9c928bf144e3eec6b0e52ae2bba533670589b2228405e28e178bb89e049a64b1
font_01_sfnt_off0001d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3AB 25336 bytes
SHA-256: f2679591f394397e7018b3fd47c694280addb2c154b4d16a54fb68fa57789b0c
font_02_sfnt_off000213a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x213A0 10744 bytes
SHA-256: be61cbbf331c2c63d88e027acf095c7d8ef095ec6ea442efac96fa77ba6edde9
font_03_sfnt_off00022c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1