Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0c04a8d316a1def…

MALICIOUS

PDF

84.6 KB Created: 2021-08-19 07:51:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 74135d8619e81bdbf8b508fdaf36f078 SHA-1: 360b35506076f6f2f28f0a017353dce37eb99171 SHA-256: f0c04a8d316a1defc81762ced299be343aff28eaf5922cfc1e727d64390d574b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to domains identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, with the latter identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://gyobel.itpublic/file/97171185825.pdf In PDF document text
    • https://martabaktelor.com/contents//files/48563692313.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/41243675494.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/o96e6iuinf23vk24r6nigsdin4/15826562046.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/juradulekovalibojadusetas.pdfIn PDF document text
    • https://protum.se/file/40603232054.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/101850283296.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9b942eace---41828253296.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/bafag.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210707080914_hntenc.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/05f42c9570bc65e94c15c5e351304c6b/58423341790.pdfIn PDF document text
    • http://gshosnab.ru/userfiles/file/31132533136.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c189553694b---16091733892.pdfIn PDF document text
    • http://prota.ru/upload/files/29653200094.pdfIn PDF document text
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/xupifeloxigi.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abab26dcfdd---16976843803.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/nakamaju.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/97c9f037f9bb2dcf50ca3b407477742f/wuzosak.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/tazifukifivosowotuxetot.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a81ec3ee6944797afa7a9cc15db23104/jifemunaginuxolukusori.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lrsag6d9gb2vcvsaj7bdbugh15/dusagepesunojudunawofajeg.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/pisatozukegenizisapu.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/58994740654.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/77157940876.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/e142a862a5e460f704fb182e5f89c1dd/64705739443.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/dokulivulez.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075db3e9879a---dexefejogiporu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=pre+writing+activities+for+preschoolers+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_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 16712 bytes
SHA-256: 4f6136d4d7f1c2c2367e671f0adbdbf821832fc9dcc014c16bae496b93fd73e4
font_02_sfnt_off000128ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EC 11052 bytes
SHA-256: baacff45b8e92eb1f00a69e8572d86f5c9c23c00986d5bf4b199a1a61fb668e0