Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f35769b161f1009…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 05:13:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8db307d6f075531256568281f99420ba SHA-1: 547029c1f20fb1ef6b4f32c23c185a736633247f SHA-256: 3f35769b161f100913c2b9019901ab39c3ecfb3aebb59f74e2c64e7f7e718791
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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=atlas+del+cuerpo+humano+pdf+gratis PDF link annotation
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160902e863ec93---wobaredudusivivavozideze.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073860d9a4fa---25595266321.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160756c8d538a3---gupumopagem.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/12154049614.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/b9075c06d47dc5deeeae5b53f70dedae/redosepigufobufamek.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/gedezadi.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160788f91c1fea---fovudokofidu.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107300143400242.pdfIn PDF document text
    • https://sealskinz.ru/files/file/gemozemesaxizumuzoru.pdfIn PDF document text
    • https://ahha.az/userfiles/file/59260723665.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/s09h6eis6reiskcqed0epr5nh3/49785048531.pdfIn PDF document text
    • http://funperm.ru/content/file/74873044574.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/60083297421.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e62db00b3---zolaturigubugaxalujuz.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/cg368itk1qb178l2m9o38htr5g/tokeguzosomujedajo.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/93774702123.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/sukobem.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/kotavivegilejetabu.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/4d74c75a9e57c249e2fd0fcde6c90dfb/zolawosu.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/78539440541.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/74829732280.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/u324ee3spnlrfh24s5omlqsh8h/jobarigisanokedizevosif.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/30285257511.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_off0000e698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE698 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAF 11148 bytes
SHA-256: baf2b66600d433b1e37ff528883d83a38633941f5fa4718a50f0b61f7c2848e2
font_02_sfnt_off0001184c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184C 20000 bytes
SHA-256: f87851c650617ca01896aee74748016b86bc705fc0effe6585edaf616498cf70

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