Malicious PDF — malware analysis report

Static analysis result for SHA-256 97e76d15139f64b1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-16 02:16:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec6d0baa3febaa791e8ad837356fcbb6 SHA-1: af5c13a71ab1a6b50c6ae6861ceb4dd34f8f7118 SHA-256: 97e76d15139f64b1c70cc040e2160b8c0e5a132dfea953988863685c154aaee0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV detecting it as a phishing trojan. The document contains a link farm pointing to numerous URLs, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or scam attempt. No scripts were extracted, but the presence of external URIs and the overall structure indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://archism.ru/uplcv?utm_term=videoshow+no+watermark+free+download PDF link annotation
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/vupega.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/wenagoxiruteref.pdfIn PDF document text
    • https://atavio.ru/files/file/pividor.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16137a782de506---pisimoj.pdfIn PDF document text
    • http://allycatering.com/userfiles/sepaxire.pdfIn PDF document text
    • https://ssmahavidyalaya.org/lion/uploadedfiles/fck/files/file/30597007811.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/mabiwijolanujapisefobemem.pdfIn PDF document text
    • http://sunwisechem.com/Uploadfiles/files/51903799503.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/72f15b22ffcfef6f06449e79b5c8f00e/2715462927.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/fobesudajomotetavemimepu.pdfIn PDF document text
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/32884278736.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/jewixudojejusoxeduzofare.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/68012034830.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/72710135738.pdfIn PDF document text
    • http://tochalco.com/uploads/files/sigemekinuf.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/wabegasazipamil.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/galovibadosop.pdfIn PDF document text
    • https://coil.hk/upload/files/gozulusokawazunixerizowut.pdfIn PDF document text
    • https://femagnet.com/upload/edu/article/file/9512366336.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133aebbd88c8---95494779677.pdfIn PDF document text
    • https://digireg.nz/upload/vadutaborakaxumu.pdfIn PDF document text
    • https://www.sonorisation-auxerre.fr/ckfinder/userfiles/files/12953862852.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/wajodofinabibevabadinajep.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_off0000db82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF394 17920 bytes
SHA-256: 66e2d12895989aea6a43ce9d352d1878713a942fbdde4c01bb096fccde3c00c3
font_02_sfnt_off000122cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122CD 10768 bytes
SHA-256: b787624ebeeda9e37576fc1d8e44794d0cbfbb9607f1747e87c9e521ee084fcf

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