Malicious PDF — malware analysis report

Static analysis result for SHA-256 3710e1dea9d15ee9…

MALICIOUS

PDF

82.4 KB Created: 2021-07-26 06:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e0cf6715008e680a3e3798846aac7335 SHA-1: 2e58994d071c32ad3199a2a0276a247ca06333ae SHA-256: 3710e1dea9d15ee9ed814918c372058093b87a42390592439158bf1f51867eed
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier strongly indicated maliciousness, and the presence of numerous external URIs, many hosted on potentially disposable domains, supports this assessment. No scripts were extracted, but the document's structure and URL patterns are indicative of a lure to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a72290c8fd0---19974603679.pdf In PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adc3f308407---41926294582.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb024dab94---86769799105.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/f7f73c8e3c08fdb29b46dd187864c0fd/zidujadelijo.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/cfb38261316c1e8a5bd17ebfafe09044/45298603177.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/rozipijowu.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/30006092884.pdfIn PDF document text
    • https://feng-shuiworld.com/userfiles/file/xopizogesavegupid.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/divadixodewakudututubif.pdfIn PDF document text
    • http://jarosi.hu/files/file/61748510123.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/af39251fc74eae4707cab709b0572a74/93931848540.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/8e686a3119c1678ada438ba65b57de11/gapilaxuwipagizokuxitu.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1c6ed094b---59498260562.pdfIn PDF document text
    • https://michelbarbot.com/upload/files/14691436747.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/33148087188.pdfIn PDF document text
    • http://fanti-fitness.pl/uploads/assets/file/67084515035.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607411665f929---40814525954.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e9d8ad143---fulazumexapagivusilasuwiw.pdfIn PDF document text
    • http://pinxedien.net/upload/files/bizagirodovizi.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/26678836772.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/20771059731.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/qucjph0fdr8cf9mjhq0n28fotv/jutotumiguxofigidudowa.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/c3cf207d2ae30c769bce32958d92b4e3/2322577768.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/vatutigibevarus.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/raxoditemerevobizoga.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cb93fabc50f---newatitikaxalogojonovu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=solar+energy+tutorial+pdfPDF 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_off0000decb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 10792 bytes
SHA-256: a5ae736ab0ff2bb9fb7f57cecbc922381aa9b4b888c65e621ea891ac3a382bb8
font_02_sfnt_off00010faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAA 16808 bytes
SHA-256: 6cecfc1899436ebf86a9bc219cf1509c4a10607be21768a26414040ee4bcc3e1