Malicious PDF — malware analysis report

Static analysis result for SHA-256 24e7a83b78bbcd4e…

MALICIOUS

PDF

80.2 KB Created: 2021-09-01 22:48:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 65aaadf37f903457e234723e2b10db89 SHA-1: 9d787de63acf2a1801226b2faf76edc3b9674f68 SHA-256: 24e7a83b78bbcd4e61703ce37a49b5cf8a0b2a39e39e84767a1654a0fcdf7c36
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, many of which point to compromised WordPress upload directories or appear to be part of a link farm designed for SEO manipulation. The ML classifier strongly indicates maliciousness. While no scripts were directly extracted, the structure and numerous links suggest an intent to redirect users to potentially malicious or deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 5

  • 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://career-id.org/ckfinder/userfiles/files/2113429639.pdf In PDF document text
    • https://hkfew.org.hk/ckfinder/userfiles/files/rufijo.pdfIn PDF document text
    • http://grupopiscis.com/upload/files/jokilelejepu.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/zevagedupumadalevig.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e030caa4ec8---kotusazimupezudari.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/12457773840.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2741d5d1b---38750139809.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/666703432.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/vepikilirugij.pdfIn PDF document text
    • https://bliznacite.com/files/bepufinis.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/bovupevoka.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16073d295b7c72---4958821920.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160939fa562e42---1278320600.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a8036c92b---gotiwofafisosugozutapesa.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/judiz.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/wosugoxolelid.pdfIn PDF document text
    • http://mrsjamesirvine.com/clients/82887/File/87721890856.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106191350385029.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/88bbbf910d58f5ad4aeb68ae542028b4/dawinez.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d7aabb1fed---66022286743.pdfIn PDF document text
    • https://ivanda-commerce.hr/userfiles/file/dalimetesofavikemapevot.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/23435940124.pdfIn PDF document text
    • http://askort.pl/Upload/file/wumexotozolativuxovog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=the+boy+in+the+striped+pyjamas+full+movie+online+freePDF 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_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 11276 bytes
SHA-256: 16a17baadcde784432d11e77a00ace13405ab0cbec887084c7c24db1d6e456b4
font_01_sfnt_off0000e70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 19664 bytes
SHA-256: d461cb7e29317a47003c2afe7caba436ba51813f2ed14b0b8e74d018f7662922
font_02_sfnt_off00011a21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1