Malicious PDF — malware analysis report

Static analysis result for SHA-256 63e295ab20331ad2…

MALICIOUS

PDF

84.3 KB Created: 2021-07-05 08:37:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dc8486cd0ef50103bc72fc8e950f933b SHA-1: 872c53b0afdb9b14639217efe21ae5393f9b0f5d SHA-256: 63e295ab20331ad2ce6eea88b17eed84ecd252e2c4bc2d04115f134ec2ec066e
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the overall structure and URL findings strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0ioalfb721gr5fet4988g9pg1a/7278077575.pdf
    • http://superpart.com/files/delamajazibinuf.pdf
    • http://ggmtc.net/userfiles/files/lirekerijuwetaxisirafita.pdf
    • https://anaksemut.com/contents//files/82529243095.pdf
    • http://cnex.cc/images/blog//file/79849414420.pdf
    • http://www.niziointerior.pl/upload/file/juvupat.pdf
    • http://usaoxin.com/userfiles/2021-5/file/gojuxitapoti.pdf
    • http://www.deopendeur.org/imgUser/file/65270454277.pdf
    • http://bezagsecurity.cz/userfiles/gexidexivejulalogubutot.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9bed6355a---sebovibunebegomaw.pdf
    • http://faw-asia.com/image/upload/files/23200488874.pdf
    • https://akproauto.com/nbloom/fckuploads/file/kozoxofasekeso.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160811f52c4735---logapevozojo.pdf
    • http://amandamaitland.com/images/file/76161811759.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609219abb8448---8094940893.pdf
    • https://mahae.hu/files/files/16010911096.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/12kqkvf2g13uofkfn0av51gv4r/94477710232.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/806e3d46aa8d2e098cd072fcb797035b/5275565338.pdf
    • http://jhsclassof63.com/clients/c/c8/c8cc7cee7579ddcd469b669c0eb172d8/File/gawile.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/5gpqel0fof67ugqq8p7lrqeoro/66851739567.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/9f695afb4bdb8c7ce691ce4011dafca6/89813962727.pdf
    • http://hakkabrothers.com/userfiles/file///59331993524.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35688e9d8---38297691273.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=velveting+chicken+without+egg
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e861.bin
0d00c06acae7ac0e077fd85b4876c64d1a765e61825291b50dac3dfd2cc2e903
pdf-font-stream PDF embedded font (sfnt) at offset 0xE861 10392 bytes
font_01_sfnt_off0000ffe3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE3 16792 bytes
font_02_sfnt_off000117f5.bin
6ddad4f41ffd0a3b4c525c7ba518525b326deaf19ebd9df25bf302ad7860d744
pdf-font-stream PDF embedded font (sfnt) at offset 0x117F5 17016 bytes