Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05a0f7536d021cd…

MALICIOUS

PDF

95.2 KB Created: 2021-07-01 00:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b0bbfe66ad160e29d2b5c9ca24276ba SHA-1: 6997efea115a6cc867e9d69b8cce0a515eb68e05 SHA-256: b05a0f7536d021cd00be566e57e17c6f5362bf21522d57c89a6178f74fcb9758
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and URL analysis confirm its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/57d82235bb7c207233d802722dcc2058/kozitik.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e35d12818a---98849131205.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160723df801f7c---fofekeroponatubewimoxof.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4b1091e4305d198eae71a1d9b17ce5a5/bimarobixuxozinal.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1b52dc0c6ccdcb6879845c49fcd5228b/likuwugexowesevijiz.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160943c9dd2180---loguzuxeropebumadojo.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160966702d38e2---29428756035.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/771707d3423177e6fe49c3c54447ab74/nojusizazipivuf.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160adafbd91ffb---xajamidurafan.pdf
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/e10c4bf9682ea61c0be61315d03fb8c6/78623306405.pdf
    • https://aashianarealty.com/file/7878993207.pdf
    • https://alice-immo.com/userfiles/file/92719722769.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a820765e44e---xekawibamilenifa.pdf
    • http://rebizplus.com/userfiles/file/3836866101.pdf
    • http://briarcliff70.com/clients/874901/File/rekeworananipeterugo.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dd76784b6---sinenuralari.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/kbi1cn6pfib3j4tpsi63g7tn5l/84878582652.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/muvanadupimivemujara.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecbc0e9566---nokadopejapiwaporugefeme.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/a7e0dc0714dc5962a08e7646f9e07348/71970046707.pdf
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a720165f07f---kamoberamu.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/pt64i763qtiteq8pt0cauvs784/pefarobosan.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c221c046be5---milidefusutonugajikusiraf.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=nosebleed+from+picking+nose
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/cf0e6ced05d28a6f6776dbf4dbdb40ec/87932994579.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f84c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF84C 16792 bytes
font_01_sfnt_off0001105e.bin
7220cb76c14f401cc7152444780de0a569a9a56accc8df2b638c5904ace8cf24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1105E 16880 bytes
font_02_sfnt_off00013c32.bin
99a98817101eccae9b8926779b476861018f1c620bafd9b9f069d7bf8fec23d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C32 10912 bytes
font_03_sfnt_off000154f0.bin
79995bd9984b9ab6d03d72ebc1eec7275890249f4ab3c8ba1a21ae00dc90e4e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154F0 17420 bytes

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