Malicious PDF — malware analysis report

Static analysis result for SHA-256 e664b889e468c569…

MALICIOUS

PDF

71.6 KB Created: 2021-09-04 12:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d6aaf6b7f19c1dd7545b73d45618dec5 SHA-1: 398c0da70a97fa850e7a8489a3ff6fed430ce820 SHA-256: e664b889e468c569892ac538d6dd5d290facb537ea23e820d8204011eb9260c7
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories, suggesting an attempt to distribute further malicious content or engage in SEO spam. The presence of multiple distinct hosts and the structure of the links point towards a coordinated effort to leverage vulnerable websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16100642644161---14119636345.pdf In PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/41623566758.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/dexajokinibezeweburivenug.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/86331733119.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16120c3f960ec8---48000073491.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/edvikiai3ggpq9obc0apeslen6/60472837319.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/lipekugipanevudamaxuxini.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/d476a018c8a16825ebe5004688f3ffc3/96623280297.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f02701525c---zipupabidi.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/3f0d1e63531b7b89d062ecd3b48575c3/vuvuzesovibizogumerij.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071d2d1e92fa---wijiguketogegedogapi.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/13093590760.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c7a7c0a8b7---vevokimekaza.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/c3297b511cdfb8b2aab889af536d63fc/menelowaf.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/juxalulebu.pdfIn PDF document text
    • http://tuvanthanhlapcongty.biz/upload/ck/files/45124950074.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/tsjjlkis8pfq0q17rdt60cc4s8/16709238536.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/de23d782dfcf6fa6667275a89a895dc7/konifod.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/74223011933.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/jesofomoxujorururiwu.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/kuwod.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cba7caf13e9---96948973400.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081827dafbe1---fuxofabuxojare.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/9ahbg8edre4i009o34o2ps0tg0/karufadebuz.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/volepekozalag.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/motisuwomasadotorogat.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/1608443b2b82ec---8861960437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=breakthrough+basketball+drills+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_off0000bac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC2 14884 bytes
SHA-256: e01d978d7cfebac680c93e528adb3f006de5b1e031544ef9759c6230b1268e2d
font_01_sfnt_off0000ded8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED8 11056 bytes
SHA-256: 92f9cc659a03dfbd400a41c587917ef9121594d4a4a79bd2df7a25bec8fa0d01
font_02_sfnt_off0000f853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF853 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1