Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af5a8ad3f54b380…

MALICIOUS

PDF

76.9 KB Created: 2021-09-07 17:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 9e53cc112d8d9c4ea3d3399e07783ed9 SHA-1: 7ad9a5f62f8d59d6c06968429eae5341b179be14 SHA-256: 1af5a8ad3f54b380edd449337779ec12096ca3a4a68d0011a66e72df99198386
96 Risk Score

Malware Insights

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

The ML classifier strongly indicated maliciousness, and multiple heuristics identified the PDF as a link farm. The embedded URLs point to compromised WordPress sites and disposable hosting, suggesting an attempt to lure users to malicious content or phishing pages. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://quaint-house.com/18794569109.pdf In PDF document text
    • http://sung1.com/upload/files/gunezelopevuluwodujapijaj.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/31674291864.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607af80c249cb---41845660569.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/fb48709458d7d5f661588e5c46c61096/kezum.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/farovexovudaboxav.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/82357821857.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/8556374843.pdfIn PDF document text
    • http://wwsm-us.com/files/file/rerajikonadimanidibug.pdfIn PDF document text
    • http://nandeestationery.com/userfiles/files/fisosanida.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/24163934972.pdfIn PDF document text
    • http://weberstellen.ch/userfiles/file/xasiraxonozavemab.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/61324665620.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/93799722897.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/ij2ff2j3pt10tud0ig6jbal5jh/55552871441.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071c35161c30---1928194043.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/226cfbde11f1b6d59f02987e772ff560/46953019726.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/zupejosijiwoditanifa.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/bivekejoxisubas.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/sujediraj.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/punejurofedofuwimu.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16074bb38be1ad---dosekanezosagafomopobi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160846eecede71---63567978458.pdfIn PDF document text
    • http://gerocuki.hu/user/file/fugitilovifu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=pdf+size+reducer+online+100kbPDF 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_off0000c89c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC89C 10776 bytes
SHA-256: 8d7648b4528d4b6de0d5e3f824683b50024605a62e487c41c6f9bb3ef0645340
font_01_sfnt_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 17136 bytes
SHA-256: f85ae3fbb038f55f7b1b84e3420a92ee024216a214705c91bef25b0c120604a6