Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa4129189843d80…

MALICIOUS

PDF

86.4 KB Created: 2021-06-25 23:48:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd4bd0341aa2b52a5abe9a4aa8eae06c SHA-1: 0a1ead7e0e374ef271b46f0dcb957571b6d3a0d6 SHA-256: 8fa4129189843d804334513e00e10ad9c120aee6ebae0efa952d036fde03be47
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160986f20a2448---wobuxapabadelo.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160abb88042376---japogitavupitufugopin.pdf
    • https://vieclamkythuat123.com/upload/files/24321203401.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae400b3459c---xiwudabubokotovegis.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7a9761aff5db13130a234b2e1370bf92/45116220306.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a759788db54---14843054749.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pomt8se0gapvtenviacj7cfjsc/68961414960.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e2f810e87---zakexusepotukofagefek.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/r5vu5bfgt1fjvq5mulqf8bniv4/81453292019.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/d97639df9e55e85c92bcb57c86816682/sekikesemejut.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a527999f80---68333338269.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2bd3e06cb---70459743564.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f9e2c44b8---gefawazusesasimo.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/acmj7pg25d0n35873nt232q5j0/46432546795.pdf
    • http://graficaeformazione.it/userfiles/file/28359737886.pdf
    • http://vralumni.com/clients/7/71/71e0d721b250bdad3664bf54e70089ab/File/katifivikaxirifu.pdf
    • http://stylowa-pss.pl/userfiles/file/89359256912.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/2f13206b8c9ba4a61081cf7e7860c9a3/kexugivugafutevifibax.pdf
    • https://bhsbeacon.com/FCKeditor/file/60489971081.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/5119462b9bc6eac7240d020e534e774e/vavekoj.pdf
    • http://kientrucnhacuagio.com/upload/files/bivodowajurowitebalo.pdf
    • https://nadamasristorante.it/file/ritawel.pdf
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/8808ee17fcd1ede3ffaf05328f80aeb4/kinefizepimalozevin.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=convertitore+online+pdf+word
    • 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_off0000f01d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 16792 bytes
font_01_sfnt_off0001082f.bin
00930bc68c7e07c943b442f4f9c427cf8abcbb3206932e2c3815b3d7ae08c668
pdf-font-stream PDF embedded font (sfnt) at offset 0x1082F 17136 bytes
font_02_sfnt_off000134e1.bin
de45814e874b2c02b0cf7bc3a976f3b666f1013a28ed57b3eaf5e169280b1506
pdf-font-stream PDF embedded font (sfnt) at offset 0x134E1 10344 bytes