Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d58c4501ac5a33…

MALICIOUS

PDF

101.1 KB Created: 2021-07-13 15:58:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0413d40ad9ff69fe0f7b9577e658b0ea SHA-1: b0aeedc502c732d0223be4057003ba171ff0bca6 SHA-256: 87d58c4501ac5a3321138bf8605f33364496025dd06f1fe4f041937e23b9e4b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9803

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://coinmarketsuite.com/ckfinder/userfiles/files/melilazapigededor.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a68b9a9d680---24399842512.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160871f358c27f---81609080906.pdf
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa12f8e6270---wibiwizare.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ab4d8174699---1164934794.pdf
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/633a92a9606972e8e0876bf0caa5b683/76323903510.pdf
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zezijigimisok.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160838104a65d8---kuzekoponotefi.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609456598f386---50654370505.pdf
    • http://megaprestige.ru/uploads/files/kijejabudijofakomepete.pdf
    • https://lionkingbali.com/uploads/file/67604868475.pdf
    • http://esipro.fr/userfiles/file/70957189717.pdf
    • https://louvre.lv/res/wysiwyg/file/bipidewapobo.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a90353c545---newekusirujaxujafu.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abd7cc38d1a---wuvevipowep.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kisj8e4tfelv1979jsamkgrtt2/44544081707.pdf
    • http://emotionpicturesfestival.gr/userfiles/file/74334475265.pdf
    • http://turnyras.lt/Files/file/vajapej.pdf
    • http://architects-desk.com/uploadsfile/20825008489.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d011a05bb---99765681867.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750dbf83123---85612134382.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c9bdb4c5479---25417408698.pdf
    • http://amuseonline.com/absite/userfiles/file/91561246497.pdf
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e79c93166e3---zufifizatasoxijefunudej.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2985332b---zolefubosisidan.pdf
    • https://scriptdd.com/_file/file/44050686558.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=be+the+change+you+want+to+see+in+the+world
    • 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_off0001279a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 16792 bytes
font_01_sfnt_off00013fb1.bin
560ecfc6f889826252c7c5982dd63f6066d9e0de66f58a77e8e9f5081acffce3
pdf-font-stream PDF embedded font (sfnt) at offset 0x13FB1 11000 bytes
font_02_sfnt_off00015920.bin
bcdb8933801b31e358ce6ac59dde3b49887731f814621932e59b72dea3e2711e
pdf-font-stream PDF embedded font (sfnt) at offset 0x15920 17380 bytes