Malicious PDF — malware analysis report

Static analysis result for SHA-256 d64e353f831fd4bb…

MALICIOUS

PDF

99.5 KB Created: 2021-09-04 00:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 42a0ab98585e4edb7e87cbb788d82adf SHA-1: dde97fdebff44723407e0a3ef1b6b0ce39a4e46c SHA-256: d64e353f831fd4bb8ccb479421005ac3175022798f7cd866d5d578c33ca64ab7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other domains, likely intended to lure users to phishing pages or download further malware. The presence of embedded URLs and the nature of the heuristics suggest this PDF is designed to exploit user trust by presenting a seemingly legitimate document that redirects to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://ketchas.ru/uplcv?utm_term=a+history+of+islamic+philosophy+majid+fakhry+pdf+free+download PDF link annotation
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a638521cf40---24234503528.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/tokakulub.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c1f2ddbee6822a95d7b6ede25614bafb/lujutavofujuxagotitipim.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/pagofit.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/jumunut.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/52882429235.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/ragez.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/sivomig.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8d3dc9035---42320907713.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/3m6r8n8drpeekvf3bddhqssleq/pasirolijex.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f39245a7f20---bidugona.pdfIn PDF document text
    • https://ienter.bg/files/jadiverinejar.pdfIn PDF document text
    • http://bscartridge.com/pic/10287201900.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc37c127ec---86154439853.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/2685512997.pdfIn PDF document text
    • http://gptools.net/userfiles/file/42469536155.pdfIn PDF document text
    • http://mousike.it/img_ins/files/48107493534.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/944a46dddde5d96f5aba38cb2758fb9e/lopinefi.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a23fa2394---ponivuti.pdfIn PDF document text
    • https://terracell.info/images/file/lukufiduvewezikut.pdfIn PDF document text
    • http://greenld.com/userfiles/52136472644.pdfIn PDF document text
    • http://meskerjager.nl/media/files/11404792256.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA9 24912 bytes
SHA-256: 8e249e18bd439714b6511be3156763b17b14f31ecd8b94ad06792be59c17026b
font_02_sfnt_off00015c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C33 11288 bytes
SHA-256: 7c1bc4e56cd8f83d3566e653c6c070b36a3d86e3db7b31cd7b3708618bffc771
font_03_sfnt_off0001769e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1769E 1936 bytes
SHA-256: 581ee6410b39f3fc3c0b7eee44a1f688a16d32601ddb4ff915e7da4a385d4a1a

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