Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64858bb3b78b2ae…

MALICIOUS

PDF

85.0 KB Created: 2021-08-10 08:40:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b07e13556275394120b640d0959c6b11 SHA-1: 2c53803f7545664614a27f7efdac9b4264c6caea SHA-256: b64858bb3b78b2aec1619c7236e79240c0d142da6e275d6a1c1cb9169d22c7e3
156 Risk Score

Malware Insights

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

The PDF 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 WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://allytemp.ru/uplcv?utm_term=what+is+the+grammatical+function+of+adjectival+phrase PDF link annotation
    • https://www.jedeminute.de/wp-content/plugins/super-forms/uploads/php/files/qf94llqf5253rt5q71be2vnuhd/zobamuxezibugiwetewede.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b2ca702b0---tijezigerojal.pdfIn PDF document text
    • http://househouse.it/userfiles/files/sorogelenuxoluzuwox.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7023f582b1---26022361479.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/b217c821660a27edfd45010354c23f9b/14551470579.pdfIn PDF document text
    • http://abnicum.com/files/file/pikibetexejamokewiribu.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/dunotivinememazojege.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/70802213369.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/f281005e9094e59a900951723d0d3ddb/98589593477.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/5a864f145be805558c4ebf900c8fc44e/14670425886.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/52332251691.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805c1a2378d---jiditexifegenate.pdfIn PDF document text
    • http://jump360.co/upload/files/20210807005805.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/2028f50e5e0b016fc0d18973b6889546/gufibatamimefipafunod.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/xusutiwar.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608022d440187---gogilif.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/53230794704.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/96232228199.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/tefexozetixesajerefel.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/63fad5f7b5f1ab101bab35f3d2565034/9107193664.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/30767936374.pdfIn PDF document text
    • http://healthywithhart.com/res/file/17897631069.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b1894ddf2---fuzudipepipaxabunimubug.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1db0b70554---wenetifesa.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/matadet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68A 17200 bytes
SHA-256: 2bb83c128c69b8c05cf12405bfd8702eba3405c7f8471b13de4c2c5e3f1702db
font_01_sfnt_off00011338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B4F 11356 bytes
SHA-256: 90a1d2b1b5c55c3e56644ebf4ec0a91b1a7de58f0a7278c52ea6136209608367

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