Malicious PDF — malware analysis report

Static analysis result for SHA-256 90bbe881a15bb2ef…

MALICIOUS

PDF

84.2 KB Created: 2021-07-20 13:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88ec581ddd5a5011a5396b9f4b9901b6 SHA-1: 980b32b36acf903a6d468332c460c8078bc68a7f SHA-256: 90bbe881a15bb2efda59a372a14f231f3cc5b1b6b0d24df19281f6e66e536d61
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of multiple external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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 https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/bq0040e8ss8s3c0debi5ir9jc6/bemizevubakas.pdf In PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a688dbe8c9---48213759791.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/eum38uo9g5thtq0av5p0p0gbt6/kiziwatex.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/vedukunesobixojokojiku.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/52461537952.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/sajaseposeve.pdfIn PDF document text
    • http://johnmarzillier.com/ckfinder/userfiles/files/pulimanibexiwisosox.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/xejulafibitej.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/bitinida.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/mivul.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b53dad411d0---tiduzanitokuxepa.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/xititedu.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b38e9bdcdce---bodopagenupevirugolej.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/rasegiwudujowelexovavejab.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f222c4dd4e---20125301842.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/68601603602.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/25735451977.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/70e8270416b734273b4af54f096fefea/72225989625.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160de6fd2355a8---7213154347.pdfIn PDF document text
    • http://medicare-darmstadt.de/bilder/UserImages/file/29861428266.pdfIn PDF document text
    • https://flyingfish-stay.com/userfiles/file/fodiji.pdfIn PDF document text
    • https://avenue102.com/uploads/file/72744193247.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/xonupukuwejubimefo.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/e36e5018f3bf41b3156856064bbe5082/sitoporojugetojifonakur.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/potatideradodopowunijal.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/be47aac5a0eda523ffd655a6beef8504/27607524071.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=anglican+lord%27s+prayerPDF 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_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE7 16960 bytes
SHA-256: 51248a2af87e18b0b554c203c30dec2ae77a6ec10adc9c4c69a23d961b69e6a3
font_02_sfnt_off00012b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B33 10720 bytes
SHA-256: 77ac20bda9566ed9215bfb360a602053173c0b50369db7900c43c06829e11368