Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47a6932e2e2afd2…

MALICIOUS

PDF

92.3 KB Created: 2021-09-03 13:35:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 395d40bd17a44e169888ff3b6c8ae85d SHA-1: 1970e63079aeace73f05aa89b5175665c1b32784 SHA-256: a47a6932e2e2afd2870861b683819f2bfa6a5e407738ffacdd5c7a6e049afbcf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs pointing to link farms hosted on compromised WordPress sites. These links likely serve as a lure to download further malicious content, as indicated by the ClamAV detection and ML classifier flagging it as malicious phishing malware. The document body is heavily obfuscated and unreadable, preventing a more specific analysis of its content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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.
  • 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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f0aca242d8---jalodukagulatud.pdf In PDF document text
    • http://centroolosprato.it/userfiles/files/sevikeginegawo.pdfIn PDF document text
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/iqmmde5pfce97t55k4aibtrcrf/75045535204.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/pofar.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdc2e7d77c---25379558803.pdfIn PDF document text
    • http://ameshamagazine.com/js/upload/files/rasifatuneraropus.pdfIn PDF document text
    • http://www.niziointerior.pl/upload/file/revoleko.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612e874eecad7---mumisituzutatafuvur.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/nenexarolewuvezibet.pdfIn PDF document text
    • https://o-dance.com/upload/files/zamomogogig.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/xifonige.pdfIn PDF document text
    • http://spadhotel.com/basefile/spadhotelcom/files/53193877994.pdfIn PDF document text
    • https://rzfmuhasebe.com/userfiles/file/medegezaposajokulidu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858463e32d1---kubukeropaxa.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/64286114a1192f49480e48877945febf/nepawedirujabe.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/mevukulefubi.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/muminikobag.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160dd7d5f08eb2---wodejafomudabemiwixubawi.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2043035db095b8a61b1dfc0a8eb831a6/javopizopijiweguzobo.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ib6mkdfakrs1d5ss3u6s7bgdp7/samifinol.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160866c3c614b3---35882280104.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/78bd36d1c85003de372dc951e0bdb4f5/revamovu.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/nigitadixuvowemat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pdf+paradise+lostPDF 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_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 10388 bytes
SHA-256: 390510eafe1069e957f05bd3cad2b799137d5f7335aeec8391043fe68698cb66
font_01_sfnt_off00011e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13667 17864 bytes
SHA-256: d1e5802b5c5a042f52fdcbbc0e1597dc3eddc6a8fa9e7f3ca950bed26729eaea

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