Malicious PDF — malware analysis report

Static analysis result for SHA-256 c633892016edaba1…

MALICIOUS

PDF

84.1 KB Created: 2021-06-27 17:50:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 61445e093142ce3aa568328f7b008107 SHA-1: 4f1ae11865c05121070e63d77f4dae0aa559ccb6 SHA-256: c633892016edaba18c554500ef32e52b3e985a058b7aefe51cf0f353f27c7658
156 Risk Score

Malware Insights

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

The file is a PDF containing a link farm pointing to multiple compromised WordPress sites. Heuristics indicate these links are likely part of a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/93h5tvb5m514le9k7tj16u1ea1/54848519771.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/dcf742f072f797b1318a5e0436543ff9/raloworuz.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087632bee48a---45024327473.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/65ef88a819314e09fc30ed22dfd3b876/pafogexukasevididok.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca204721dc---8540078197.pdf
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b19967c7fe---fuduzerofikizudubuzafe.pdf
    • https://kraftyz.in/ckfinder/userfiles/files/wadejajuzami.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/7737d782e54c5bdaec8f9416e497feb0/98485506696.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/5eba4c5ca8ef22b83b392055c359c238/vopufoleja.pdf
    • https://mytopics.it/uploads/file/90185028255.pdf
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160888f5c1ef0b---65023446354.pdf
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/e6a1aa662a5df1a150e64571ad0d7964/dinugurabiresefereraven.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/253f1256a0d220c8712e19a276d625c3/51139777177.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a4870feead3---xugatoberewukirenedi.pdf
    • http://aelma.com/sites/default/userfiles/file/taseditedike.pdf
    • http://solarexperten.ch/fckeditor/editor/images/file/mepaxugukip.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/3e6j5rdch0qvjs9t5m0vmnjv31/29688426551.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/i7hvvs2g1gkushc3pfqq79hi00/lexazu.pdf
    • http://cosonhuath.com/hinhanh_fckeditor/file/farikiwujijad.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/b2154b3b2c0e04e2045463900d141844/ridubodaxateseruwi.pdf
    • http://meadescafe.com/userfiles/file/vujozabonawajuked.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf4f861a0---39101781940.pdf
    • http://czdashan.cn/uploadfile/file/2021043015030273499.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=7+cups+therapy
    • 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_off0000e9a6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A6 16792 bytes
font_01_sfnt_off000101b8.bin
431139013722ee307c6008de1ff5337dbe1a37de8074cd043347206dab1300f7
pdf-font-stream PDF embedded font (sfnt) at offset 0x101B8 16556 bytes
font_02_sfnt_off00012c28.bin
0a7dcae5c541b247c67d5d15074882d6a53399a78bdd63b7f71408caaa5ca639
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C28 10276 bytes