Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b17c5271c3ef1b5…

MALICIOUS

PDF

76.1 KB Created: 2021-07-07 03:04:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6225c7307cf6c512fa8781533dc6f9f5 SHA-1: caa6005ca960489970ddaa50558d2a60785de319 SHA-256: 9b17c5271c3ef1b5c348e15680bbbcf8d6cdacbabe49a65c66b8c04754d8cbe4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The presence of multiple compromised CMS upload links and disposable hosting further indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://allytemp.ru/uplcv?utm_term=institutions+and+organizations+scott+pdf PDF link annotation
    • http://buildinggodskingdom.com/webcms/file/xulifuxixitipipam.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ceca90dd02---rejolef.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/8ee644e5bc412dcb84ee64b8cb9f946a/38190558704.pdfIn PDF document text
    • http://hyundailed.com/upload/editor/file/betelefidi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/6d403c6f533ed80f4ed725969bc40655/romativijolak.pdfIn PDF document text
    • http://smn68.com/clients/75339/File/vefopugamujidogev.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210618011531.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/9404857778.pdfIn PDF document text
    • https://esprimagroup.com/userfiles/file/13115957127.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/topuxukedadabodovefego.pdfIn PDF document text
    • https://ebooksweb.net/files/file/watupodemogifotet.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/34804939907.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/nidukoboxojabapaxagib.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/a260f942bc78b3be479ab849de45ac57/nezagelupezupame.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/24498190270.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfb7323e0d1---34080017878.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/menominewefolasadu.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5c816fabf---wamotixukib.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1607c72f0d8794---daxovutuselaragud.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16082749d92173---saloxum.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160e1e88d0d402---jikuraxakilato.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160711384e5b12---sarefawuvekitudatefolute.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608798e52006b---60476913216.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_off0000c837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC837 10728 bytes
SHA-256: 6381007ba262d04c4970142ac55d7b408d10969c03bb98bb634085ef03ed9caa
font_01_sfnt_off0000e0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CF 16688 bytes
SHA-256: f5b8f4932784f03a74a02db7a72961de8addd70b4f67d7c05a35fe0add6c3b6a
font_02_sfnt_off00010b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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