Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6b9ea3578f5030…

MALICIOUS

PDF

93.2 KB Created: 2021-09-06 22:16:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2818c208497dd089aa97eb96ee8e7ac3 SHA-1: 3da7691106795c95fe8072ca9982510b01e1e612 SHA-256: ab6b9ea3578f5030b6006e3a40b2856453674d9af18a2af6276118d8f6b666fd
96 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites. The ML classifier strongly indicates maliciousness, and the heuristics identify the document as a link farm on disposable hosting, likely intended to lure users to malicious content or phishing pages. No scripts were extracted, but the primary attack pattern is the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a3f1ca347---dokoxerunabi.pdf In PDF document text
    • https://elpmarketing.ca/wp-content/plugins/super-forms/uploads/php/files/7e92457bfb6b468d505c8c802dce15b8/49362162016.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac929a6fb81---59674297542.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/iq6b7c4lorg3lq96vols7d2mer/mezejefalobuwoxekox.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/37255999985.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/41030673704.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ac53aefc0757355a1377e5aea31c0ad9/xedowuni.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name//files/lonekekeg.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/71dffa8af5b5fcee87a7550f3f67af81/53114111906.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/beruwifaxugumali.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078bb03901db---diwamun.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/fb5thaj69c304tb5s73qsnr3fe/13720260094.pdfIn PDF document text
    • https://bak.vn/upload/files/21618437567.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea3587c865---jazimojojo.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/isu7a69fff0gg99ipvhsmmd9s1/fejebarasawefowuxaj.pdfIn PDF document text
    • http://chokmanee.com/userfiles/file/14432715661.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae522a57f3c---zotirujuxidi.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a3ce8a55327---13308921290.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/luejrkcqlopp5s4k43hvfb32g2/norolarulipopalevupitev.pdfIn PDF document text
    • http://landpas.pl/upload/file/zaxuvixuwiguxize.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210822230744344.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/26723435626.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///bujupuxonumefopola.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=ffiec+manual+brokered+depositsPDF 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_off000108ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108EC 11092 bytes
SHA-256: 842efd7cebb449e989321b1e616509e3fe8090ad867d614838051e6bc5f033ae
font_01_sfnt_off00012282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A94 17356 bytes
SHA-256: e0b255a5746e4164b7845cd74ae8297decd438de92a87d2df280f0fd0e8aec8e