Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a67ed90a07b9c9…

MALICIOUS

PDF

83.7 KB Created: 2021-08-07 06:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: d4960e606da70f055f4f8714f21a642a SHA-1: 03e05ad252e71b5ca0af7dc47ef577b5118975a8 SHA-256: b6a67ed90a07b9c94536575cd4aa05f60fc692a443688b0eb9bc8091bb7262a8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites, likely to host further malicious content or phishing pages. The PDF's structure and embedded URLs suggest it is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/aad94eface9681c7b1085d7235e7dcff/jokexutizuvedizirexosewev.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/edhr51mnb2ev1s8a35au2kbr5a/5484195535.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/mawikotifazadabevumabadur.pdfIn PDF document text
    • http://mlight.cz/archiv/file/raliluwulizejivujalafep.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/47320876256.pdfIn PDF document text
    • http://traviet36.com/upload/files/gusov.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/bibuvepitibolimutu.pdfIn PDF document text
    • http://enewind.com/pliki/file/jemotomajowesanu.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-07-10/images/files/lefimuxudaxepexunegiloj.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/82217799281.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc1fe000d4---49173806764.pdfIn PDF document text
    • http://stickers-moins-cher.com/userfiles/stickers-moins-cher.com/file/36277672486.pdfIn PDF document text
    • https://upaspor.com/resimler/files/laliwuleriposivosakux.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/21668370499.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/somedelifixinusanemidog.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/segox.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/edf40f6280c5ec9ea77e0d38b2396436/13347963107.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/057b8fd0b1b366589d825c05aa00992c/jatenevisabe.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/2105679018.pdfIn PDF document text
    • https://cncunse.com/d/files/58201662333.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/7d0554c83352f555e568f02d225d68fa/batakuzatupaverinil.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/4ffc83196f455b518656416e611b055d/6069838762.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b53795c84a8---lamaxevaxululo.pdfIn PDF document text
    • https://lucky-erotic-massage-bucharest.ro/ckfinder/userfiles/files/18709303489.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/l2s3tm8lrm6lebgg2ls499e61q/tivurubiwefaret.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=comprension+de+lectura+ejercicios+para+cuarto+gradoPDF 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_off0000de15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62C 11116 bytes
SHA-256: debefe24fbe64ff62e818cd1f45849bf3d1f958436feae869b8139f60990644b
font_02_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 18416 bytes
SHA-256: eddbf719f64501bec2e8b24798aced844a9fc52b8108113148da37e2f5a4fc2e