Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44316f047d387ce…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 17:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 6f9b9a8733dcc91f7c89a93afcedc41c SHA-1: 0274fe4a4f90b8a7c7d6d79b8dce5cd0d21a5ae6 SHA-256: e44316f047d387ce789ba640f315b0170771538df1c2b04e1437005568709ffe
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by 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 0.9996

Heuristics 6

  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://mmbc.cz/_data/user_files/file/viwavomaleliluvit.pdf In PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/542a91c72cc3ad863170a7a942b3d169/xavidomomorogo.pdfIn PDF document text
    • http://pvvc.cz/files/pufazuxem.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16097388fe841d---53117917307.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862abef3469---refubununuwemex.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077b45e46e23---69001328001.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/8c230cf25c110a050d27314623d9a6dc/54286182389.pdfIn PDF document text
    • http://aps-mes.com/files/file/kijut.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/nukidabibaw.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/ca615b2542b7a3b46335166b977f22a2/futuwidenaneralunov.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/qqu24tdqdalbbu216r15ko65q5/jusujevevirazuvokuj.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/tccs89k0d8fhtarcmua1nc4hpk/jenenom.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/vonowitepowanumo.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/l5pum2kivb4h697irafjggv09q/tizij.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/b143fbbe0255aa0970aa7660122f333d/puragajujojo.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/vugujifozowexite.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d3bf82183---94837435898.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/8e3e314e4344680ed55f6d747b942d4a/besevisigozanotijewosizu.pdfIn PDF document text
    • http://ongnuocdenhat.com/upload/files/pufebigererepuji.pdfIn PDF document text
    • http://www.odnpoznan.pl/fotki/file/file/77713859673.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/zafogotuzafo.pdfPDF link annotation
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/1051063711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=why+business+models+matterPDF 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_off0000be1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1A 15696 bytes
SHA-256: cfcb5499f1aacdb0ccc6326477dc667547a600e5a0740cfe2d06e60045c45631
font_01_sfnt_off0000e5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C5 10860 bytes
SHA-256: dab7db305f1065a8ff1c502087704ad9c56ba8f803a42bc30af4f6e75f494c49
font_02_sfnt_off0000fea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1