Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6179f6fdcd09c8b…

MALICIOUS

PDF

85.0 KB Created: 2021-09-07 19:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f16cedcfd788e3b8fbf5627bc0bf956d SHA-1: 38676fd020131ace690ce47b852431f9b169233e SHA-256: a6179f6fdcd09c8b6cf197217d8cdee3f849e16629b46a55fc0c09f7af08bd1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://queure.ru/uplcv?utm_term=sage+secondary+data+analysis+pdf
    • http://szyldkj.com/luodan/images/userfiles/file/50568168962.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/widagurekapudu.pdf
    • https://royal-art.pl/uploads/userfiles/files/kebesidupozorejutar.pdf
    • https://fcr-fomentoconsumoerenda.com/uploads/files/17752530378.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/51642497297.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/2bc1908a5bc2eda972609216ec8f9e20/vudusuref.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608413feed27d---kiwirafetupukifedu.pdf
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608070d1c5a93---pawapirugelegisuzivezaru.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/72504989588.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bd411f6a8---33356410236.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094149faaa04---898537432.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e54759e54---fokafezawosek.pdf
    • https://mediaget.ru/userfiles/files/bufikemotinimevaj.pdf
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c443035a4b1---54954519834.pdf
    • https://sedefartphotography.com/resimler/files/bubomipol.pdf
    • http://unsersohn.ch/images/file/xikijuwun.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f1516ed303b---32322722413.pdf
    • http://booklandbooks.com/userfiles/file/purabavupejope.pdf
    • http://agriturismocorteerbatici.it/userfiles/files/82175240405.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/99ce8985e9ed9c325f6aea438ecfabb6/puxobokudegisimurasapude.pdf
    • http://faizleathergloves.com/userfiles/files/12736414080.pdf
    • http://beiwendq.com/userfiles/file/xesovitipemerinore.pdf
    • http://shannonlakeestates.org/fck_images/file/23567165363.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7ae.bin
bea29d229488b6abbe8610b853e849507346629b3df0005cf35dcc61fdc46ce8
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AE 10984 bytes
font_01_sfnt_off00010115.bin
e50fe2bb6b4ab81e580931e743e38f7037f8145a5148d2c40bd462741d8e8887
pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 17612 bytes
font_02_sfnt_off00012ea9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA9 16792 bytes