Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3aec93ae4545674…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 23:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: febff312c6439677ce88a174bf48255b SHA-1: 1ef3886a5bb2738b0932a9ee21c737b0e51070cf SHA-256: e3aec93ae45456741e3b43ee45ce36b4253f9899c78e09d8115ac75ae1063b74
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also features a link farm pointing to various domains, some of which are hosted on compromised CMS upload storage, suggesting an attempt to obscure the final destination and distribute malicious content. The presence of embedded JavaScript indicates an intent to execute code, likely to download further payloads or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://thibangoto.com/app/webroot/uploads/files/10677047278.pdf In PDF document text
    • http://principesgs.com/userfiles/file/40792589421.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/49177738124.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210906010955.pdfIn PDF document text
    • https://eternalbliss.net/file/ziziduvoxul.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/futipipelibube.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/998d982555b9b00b85257084f7bbfad2/kagalujefakudajaget.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/4750853477.pdfIn PDF document text
    • https://doosradashak.in/ci/userfiles/files/31081148714.pdfIn PDF document text
    • http://lex.tj/img/file/54104728810.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/wasadiwav.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/jupojemekubuvat.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/nukapan.pdfIn PDF document text
    • https://langumeistras.lt/i/File/vevevejov.pdfIn PDF document text
    • http://nexxstep.nl/userfiles/file/pavuwusudumitonadukumesu.pdfIn PDF document text
    • http://chpcentre.com/files/file/kutigoro.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c753ca42---28353102759.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/ab51ae7c6cd28249c9931673480957cf/badezuzobudovoxosupow.pdfIn PDF document text
    • http://bankkartya.hu/js/ckfinder/userfiles/files/23963222924.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/39055257817.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/riwojaregumopiwifepipe.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/fogiweraxizipiti.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/jo66eb2dgbst245jso4gpc5j9v/96422599755.pdfIn PDF document text
    • http://insureavisitor.com/userfiles/file/josufilavabomuva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=economist+subscribed+apkPDF 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_off0000e2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFADC 10944 bytes
SHA-256: 362632403db08da7019ce1d1ac5564091594743a5e762edb5cc2b3ba09a262d0
font_02_sfnt_off00011404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11404 18428 bytes
SHA-256: 88cf7fa257890fceb3cfa508f653f98ada15b5fdcede7e8f468ec5b17f1b1905

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