Malicious PDF — malware analysis report

Static analysis result for SHA-256 8583b3f428ea9389…

MALICIOUS

PDF

83.7 KB Created: 2021-09-06 03:10:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0eeaaf5e81a1dd18ad1be75ee50bcfb0 SHA-1: 178b09d617c924b0d7b1113419556480dc8823de SHA-256: 8583b3f428ea9389c5c374244df21065b04937616356e61fa0c883820af670e5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable binary data, providing no direct content clues, but the heuristics strongly indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://keacg.com/upload/files/lazupudejadexidejijowa.pdf In PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/6a3a70832085db466c1218368daceb78/visuvo.pdfIn PDF document text
    • https://anfauglir.com/images/file/loxoxidalubamav.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f35b340c---xepuralu.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/ju2qr7a2ahoddthvt2orfgj0e8/sipiwiwut.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bf7b31cba---wupanekefefevuzuwure.pdfIn PDF document text
    • http://lg-palette.com/upload/files/fadixoxoxikufuxarefalekul.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/nakidako.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/gitisivilo.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/pubugapejadubimux.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/26d6vc2n4e1p9f2hc2qlp1elon/19800804807.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/24612732692.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ff84d50bd0d8af0f05bee9133e604f21/93186654725.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c43bc10d3fe04f2c9c563641cd8caa84/48253927217.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/36330431322.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/f246c6b9cc725bcbdb2c0f01edc18734/50779116933.pdfIn PDF document text
    • http://zatacorp.com/upload/files/34272253606.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be8d8fd9b96---bozaritunisofaxirita.pdfIn PDF document text
    • http://isgsrl.it/images/file/fixalap.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/f62bdc3ed7f8808367df1dab11d2b1d3/32969516260.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2314a22d1d70434ab74df2d9ec88f2fa/11745995682.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161193d30a1500---visenugupubo.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/vupotunemipevune.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b536029a24e---juriwajebejigafuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=artikel+politik+malaysia+pdfPDF link annotation
    • 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_off0000e07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE07A 10740 bytes
SHA-256: f177b8b80453bfde644b98b1957bd542f93a2dafbc29224330d5b48a1c49f0f4
font_01_sfnt_off0000f938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF938 18744 bytes
SHA-256: 7c24af787cd1f34e30005fb3d3e5bc810ce13248ccd68ba4acaf2cfbdef91ae5
font_02_sfnt_off0001287f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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