Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a29bf910cae04a9…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 01:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6c049a9f7eede9879995061c10c1fa20 SHA-1: 0bb2f96071184687cca9d0caea6e726c90a96fd7 SHA-256: 3a29bf910cae04a9e566d2ac962da909e798db02023e9d55e2dc8e21e92c6e91
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised or disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab8751cf75---rudepabenagefosegile.pdf In PDF document text
    • https://aljuboori.com/userfiles/files/mimisobajugurup.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/51929999092.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/76843105124.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/butupiluba.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/c5a2c3e312c3b9501fb1538886940e23/98717417414.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb471d4a41---bewukewunezejevawezerap.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087186a0488a---23709991183.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/dijinem.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/42218035172.pdfIn PDF document text
    • https://hoongnau.com/upload/files/basafesolile.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e04b85f0ed3---gumaguzujif.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/a8f15485b36f1298ac9192a5169f7024/5285171228.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/77545670779.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/wavevugupemezenanos.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/wokasidojakejozesu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89f781f2e4---xobifimubelarewukovogiz.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/bateguxajewopajerogujugu.pdfIn PDF document text
    • https://bak.vn/upload/files/57127668067.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f7ab633b1---54282906734.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1c7c4246cb5a723a5c223c04fbc756ab/46860256073.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/masetow.pdfIn PDF document text
    • https://suthuytinh.com/app/webroot/uploads/files/domeluza.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/24045422033.pdfIn PDF document text
    • https://datajournonepal.org/files/popuvijal.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611b1f348500d---konikewuxikimevafisikoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=que+es+terapia+gestalt+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_off0000cc50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC50 10608 bytes
SHA-256: fd791f185a003cab32e363b60ef5750b67e51ecab5940baecf2ffaa1feaa4cc6
font_01_sfnt_off0000e494.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE494 17184 bytes
SHA-256: 8021a8b4eaf1e6405e784b30933f86a4e333e5b018beccd58d23edeb04ad6ebb
font_02_sfnt_off00010fbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1