Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f6882175c5e434…

MALICIOUS

PDF

84.7 KB Created: 2021-10-19 01:38:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b6f8474380a70b54411f6e6d54ff8c90 SHA-1: 5dbd3b2b99910f70a631dc54803e3de69e180cd8 SHA-256: a5f6882175c5e4340e563d1a89eb0d6a3a901fd4bb879fca13f5eeea1fb657ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous 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, but the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ateliergermain.net/sites/default/files/file/sobulozifemux.pdf
    • https://psfund.org/public/uploads/files/cms_files/safizaz.pdf
    • http://balatonfurediallatorvos.hu/userfiles/file/tamupufagirilepapajel.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/4e39e5f8f0a8bdd4216944a5e23531dc/27659781417.pdf
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/90801292550.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1615c12726e966---biwerevidejiwu.pdf
    • http://kirilmazbardak.com/userfiles/file/bigozakisixori.pdf
    • http://nyitotthetvege.kastelyszallodak.hu/userfiles/files/39515867814.pdf
    • http://kag.fr/userfiles/file/xekosodimararegulofamava.pdf
    • http://orvositudasbazis.eu/images/upload/file/jigenilewefot.pdf
    • https://s-serviss.lv/userfiles/file/xividesusosokukomigus.pdf
    • http://vswet.ru/f/tasobezalubajupupe.pdf
    • http://www.amedna.com/userfiles/files/5254267763.pdf
    • https://apgr.eu/UserFiles/file/92775402118.pdf
    • http://kirakuramen.com/uploads/files/21206549578.pdf
    • https://ski-valloire.com/ckfinder/userfiles/files/jumutuxubizazazadakaku.pdf
    • https://hobbes-group.com/upload/files/49547822544.pdf
    • https://weingut-suppan.at/files/fevobusedawusebosatimusok.pdf
    • http://phupmirpol.pl/userfiles/file/wirajufoj.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161514ac347e86---97211826871.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/0fb1638b0c313cb5195ca41af442543e/22467580069.pdf
    • http://studiolorenzoni.eu/userfiles/files/tuluwinonijuda.pdf
    • http://escritacontabilidade.net/fotos/news/file/64825530008.pdf
    • https://alcoquimicos.com/ckfinder/userfiles/files/96143252344.pdf
    • http://inannamsao.com/uploads/files/xebikugevadisume.pdf
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=tabela+de+verbos+regulares+e+irregulares+ingles+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_off0000e24b.bin
07d3578b678bd97457d1c7a595b36c6060420ec31f5ade1254df0c8569d9834a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE24B 20008 bytes
font_01_sfnt_off0001138b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1138B 16792 bytes
font_02_sfnt_off00012ba2.bin
f740c57f304a559d87fdf93418f9b60a483a429640f8bb59a70f53807e8a2ef0
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA2 10844 bytes