Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d45b817601b0f45…

MALICIOUS

PDF

104.7 KB Created: 2021-08-02 04:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6c41deb2e8c4e2bb0ffd29e8aec7403 SHA-1: acceb7ee47be675a5be66790eca311cfd759f444 SHA-256: 2d45b817601b0f45727bfee47d7fe1d0f78b8e408504d569cf56789dcac3e1fa
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs, many pointing to compromised WordPress sites and disposable domains, indicating a link farm. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and numerous links suggest the document's primary purpose is to redirect users to potentially malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/g3vb0b147j4p5cggus7kg4lv5a/vefozefimukepuwis.pdf
    • https://csn-alliance.com/data/files/20909695253.pdf
    • http://scales-center.com/shop/fck_file/file/zopabifajegosunuvajipa.pdf
    • https://securityguardsupply.org/php/uploads/file/25275973602.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2df01be6b---20249767262.pdf
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c622f39f809---91441094274.pdf
    • http://seamacros.com/upload/file/30525024774.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160828157d73d8---xixafizizinizufojija.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160802dd737ecb---mobimulojupikitufa.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16091f4e907a44---97837688752.pdf
    • http://fogathajtohirek.hu/fckfiles/file/57824658260.pdf
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/151287619972b2a83bae4e51a97cd634/kenerak.pdf
    • http://bigxra.com/uploadfile/file/2021061107024973499.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2c92219b0e6a805ebd733d4151745390/83460250221.pdf
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160888025f2cf3---77252754511.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8894487af7---wudobela.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e0fb0c3a---darefovaleguniverox.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4bf00f15cb---vifakaruxi.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16071c5eee31e6---38398058837.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd4851b3e4---lutifibutetigizumido.pdf
    • https://ntiverification.com/userfiles/file/7736022285.pdf
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e89210a2b821a68038fc012de25ab124/fexodoxibilumosax.pdf
    • http://veterina-hrib.cz/user-uploads/files/ferefigajideverikef.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/d13eb8c4ad1caf1c05739fd9d4f2c6d9/velegitonopuv.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=algebra+1+unit+3+test+review+answers
    • 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_off00012f38.bin
4af39bc9a314178a70495da1446b06c6c365a7b399a2c482bc9508e4419bf201
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F38 10760 bytes
font_01_sfnt_off0001483f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1483F 16792 bytes
font_02_sfnt_off00016051.bin
5e66cbfe72e3921cf2b665648c7244b7ed97037a45197e70e7f0184f79593e9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x16051 19292 bytes