Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b864045476759fe…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 06:31:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 85f70d236db8eb8a0ec037e806253b35 SHA-1: 6f7326002789b63ba6fb9ce84f3479afc0ee485e SHA-256: 9b864045476759feb9e3b965b66d0d32abf3e1cd7f6e41af091618b6c2d83db5
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress upload directories. The document body is unreadable, but the presence of numerous links on potentially compromised sites suggests a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49f735bb2f---60756052320.pdf In PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe3ed58857---5683246993.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8f52900e0171771e6dc1a3bb5205057d/11722835342.pdfIn PDF document text
    • https://sankohomestay.com/userfiles/files/gegefejobefon.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/mokuwaxuvu.pdfIn PDF document text
    • https://rowsontw.com/shopadmin/upload/files/78145958106.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/u5qf1blllepplklchqisdjutdv/11718236052.pdfIn PDF document text
    • http://mastervin.ru/files/file/jafavofefewotazeko.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/7b3329420469469fff7c8dc8312dffb8/zafezemi.pdfIn PDF document text
    • http://www.asslar.de/downloads/8016361883.pdfIn PDF document text
    • https://brakos.it/file/gemukuk.pdfIn PDF document text
    • https://luminex.pl/upload/file/62108574888.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2c3706bfcb---89740193357.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0888ae54f1---vatosewolosago.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160849a17ae61b---58475140992.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607592a1333a7---jifutudeduximolenovoxug.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4288a84e0---tekedonevalosavaburuvis.pdfIn PDF document text
    • http://ecohouse-lab.com/userfiles/file/22343478504.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/45725757675.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2c3476110---fugepevekugarazaloxoledew.pdfIn PDF document text
    • http://kodemari.info/data/files/gefumol.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/9e228ac84275c20cdfdac0d1fb1f2c92/42240056719.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f955c03987ee23cb8881c5d58d9060b3/mebisigoruxerupilax.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/t0em6gq3m6m02b6skp5mt5lo80/joginubip.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/xuzokedegubukefov.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/sofujogasipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=apple+mango+smoothie+for+weight+lossPDF 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_off0000c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 10872 bytes
SHA-256: 0f28f2dc1ef9042b23bb6ae9be805db8663c6f996db83a1f7654be680d2092ee
font_01_sfnt_off0000e21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2C 16952 bytes
SHA-256: 4f40690446273ea7361d56f35cb02a6de15c7a91b2484cecf163feadfde2ac03