Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad33ad107800f1e…

MALICIOUS

PDF

75.5 KB Created: 2021-09-06 12:48:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5819e655a197330b466c2324c6895b19 SHA-1: bc753e4e848d8f64a454f22fec8eb679a5f68296 SHA-256: cad33ad107800f1e5869d581d75a70557ed5e2abc6ab1c861afb5a09a364dbc4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised WordPress installations or disposable domains. This behaviour is characteristic of phishing or malware distribution campaigns. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b1faa1f04---wajinafutixemarupeveliwef.pdf In PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/55f8287b718c434b6b1149e916f4ecf8/53472840094.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/wufiwemetunuramaw.pdfIn PDF document text
    • http://elskenecologie.nl/files/jewid.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/posanok.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/c3fc2b47280214a9c19a0fd73fd1ec23/93540863189.pdfIn PDF document text
    • https://buyafranchise.org/files/files/1131173588.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/setaxejunovo.pdfIn PDF document text
    • https://agrachoff.ru/wp-content/plugins/super-forms/uploads/php/files/eecee7d31e92ecacdc35cf359950cace/xijonavabizegibupexamog.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160712636acb66---28351958421.pdfIn PDF document text
    • http://posekatzahradu.cz/files/file/13040321220.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/14801873628.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/medumorabokizomizaxibuxi.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/e9k1hqm14b11lm42f4eevmadav/85133875402.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/jufojokinizatorizepej.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/vebufekefimewumupagez.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/naxusowupisu.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/s3f63qmhhbi2r1vv2ki2div90p/rubanaze.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af90cf4edb2---74636091908.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124e9d885724---12666854602.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/jifuvajatona.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/d3f6af133749b28eb163613307e8893e/tizavinediwesez.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/sorobi.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/32749292422.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=division+worksheets+for+grade+2+without+remainderPDF 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_off0000c223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC223 16628 bytes
SHA-256: 44466b5ce8f613ff6a56a48e55e99295552c506d348c8efeb4f49fb29e420170
font_01_sfnt_off0000ec31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC31 11220 bytes
SHA-256: 47375ddf00246b74ee0dcce428ee6db054ad7fc9666392f511e059e8202d5207
font_02_sfnt_off0001063d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1