Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d29af41b9a95b3f…

MALICIOUS

PDF

79.9 KB Created: 2021-09-01 23:16:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: ce779887c19ef9c0452e2df2d8d1fce5 SHA-1: 03aada6ce03b4174215d5a20c6884c0f6e513d5f SHA-256: 5d29af41b9a95b3fd0063c45b77fe00568ad617d4704eeddc0c5cfe829acb5cb
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 0.9917

Heuristics 6

  • 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.
  • 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 http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/59294102050.pdf In PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/jotaledesasiw.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/e95a28fb37d99785fc13286feebbf42a/69610209680.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/kukolivitopobatanigosireg.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/85346728446.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dd52c236a9---38515176122.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/0da39005a7941b33de67114757eb6166/vojaxenizeleji.pdfIn PDF document text
    • http://computerdoki.hu/user/file/97327926987.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3c9fbd007---12965476333.pdfIn PDF document text
    • https://avphunter.ro/ckfinder/userfiles/files/40502209471.pdfIn PDF document text
    • https://blogsma.com/files/97637451182.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-2/20210502212603103597.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/479ec733c23b598248cc38f3b08a4b44/nevogiledosomipezerapemev.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/xivojidefixot.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bebba4c18---67221620040.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609037335a1f8---ruwumufidosegowenatiwus.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/lopudebora.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160b416d4970bd---kurifeb.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099cdd7aa2e4---budebewegodogegugivovo.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/19251409375.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/53270018513.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/45042348542.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/14784900085.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a8741496ebb---sinabatugomusu.pdfIn PDF document text
    • http://novafish.it/userfiles/files/vofixiresudibisudofemada.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/5i73bfe9j72f66k2r4esfrh48f/fepigot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=2018+a+star+is+bornPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82F 19412 bytes
SHA-256: 68ef81a719a55e3c319d717b976a4746c7f0d91d77ef92bafabef1a38590e3da
font_02_sfnt_off00011a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0F 10468 bytes
SHA-256: 2efe5f967a5ccd5d91ba531e0659a7ea956f42e95e9f78b8ec0df1e127106f94