Malicious PDF — malware analysis report

Static analysis result for SHA-256 3abb90ab6b4e77b1…

MALICIOUS

PDF

75.6 KB Created: 2021-06-30 08:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78f31f46c4920d24a07c9bfb97695415 SHA-1: dffe3d69699a01bdb9eadcc741d50c7fa6e1486f SHA-256: 3abb90ab6b4e77b1922916be066dfe566e29fdcfc3d7fe2a237ad54e79a12214
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting further malicious PDF files. The primary attack pattern involves luring users to these compromised sites, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://inwebjor.ru/uplcv?utm_term=all+in+one+tracking
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1c0436d3f---28165584421.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/g8spbh47gq352tp0l7ip0nttc6/kesoniguzut.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/8pn16rol7ot8qhifq5vnlo17gj/13153484216.pdf
    • http://tubietelbar.hu/uploadfile/marejuwedu.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073db7a3dff5---jasozigadagizufizak.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160768d97949ef---kusamiwoxegijedogiz.pdf
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/8acf0b7894f3f8a359ecfdc8e2a38600/fukujoxif.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609baa3c15a8d---lutuforini.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/298c358260c87fc806b53e1f1906bc2d/garazader.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086b98a1abd9---zedemalifixowizujodubof.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c692304da3c---34795360393.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/5f6df591bdb2826412f125546aa04157/83301596705.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/3t4fbkfc21pevcjbl2smnjcdvb/sodebowozalivo.pdf
    • http://hopkinshigh1988.com/clients/75739/File/vezilakejolu.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080b5ea30722---20751420496.pdf
    • http://10glazsikeyrosa.ru/file/59981217385.pdf
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/d798fdc8fc291fbbc0b33b17f5862fa5/77116741708.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cac910da2---80059780018.pdf
    • http://nesthomes.in/userfiles/file/jotamilat.pdf
    • http://yaqeen-eg.com/userfiles/file/pexemise.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160728cf669897---nixil.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/katojifebopasorojal.pdf
    • http://alexhofford.com/temp/files/file/negozebiwetabotobojo.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c06aca704f---78768809325.pdf
    • http://elitvorota.ru/f/file/fumomirivinesijefijemere.pdf
    • http://www.aluvascientific.com/UserFiles/file/57143974905.pdf
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/e8fc677263d70a2de7077ca241da8b84/netotekoxumumibegit.pdf
    • 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_off0000c949.bin
b9df7610a1c49a69454771ab3f5ba82aa085b74b5763285d80cd3284aeae4f25		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 15672 bytes
font_01_sfnt_off0000f1bd.bin
3253f3a0ed5545ca6d57dcab761cfabd0c4ea0a8e4d668ec2d0d6d9e186f0235		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BD 10312 bytes
font_02_sfnt_off00010923.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 16792 bytes

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