Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad07b1397447df7…

MALICIOUS

PDF

86.4 KB Created: 2021-07-05 20:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: fa395fc0444eeee1172e274a6b8c92f3 SHA-1: 5684f1fc5f23624b38aff388d5d1f5b17eeebde6 SHA-256: 5ad07b1397447df789a4a5ffdf4ebd878a0448b709fa5f07645ba218d1e1b36f
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, directing users to multiple compromised WordPress upload storage locations and disposable hosting sites. These links likely serve as a lure for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/f65ac6d423f4efd49eefe2118f83f135/dajexilokebojidenetu.pdf In PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/n9q89usvn0o2n5n59immt08jo4/78111173294.pdfIn PDF document text
    • http://mpu-beratung-brendle.de/userfiles/file/48764022181.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607079c77e1ba---84440691855.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/dapegixemu.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c85f540e9ed---13900886088.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160795f22b8550---nuxixilaminuze.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/gurulijupevabosasewam.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/k476p2ou61hkea299f2mt74rd4/rukaxajoxi.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/79278632469.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/29602927813.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/59714714979.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab28de42fe4---virukori.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/77636254110.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba69abc6e17---64498300529.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081a499a98cd---ragimanexomegafipafakax.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/zegapuxufojolanixuzevafe.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f7d0302c8b623dcd4ecf2861e41d22c0/lebukuluve.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa83e81475d---8325688237.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/187a78584f7418c91ec79d7f0445e9ab/43500244341.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/10a50d09b50d31b410265ce5331a970d/xuzenasonebefijebivokesot.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa3a04f4e2---jalizuvozofobu.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/rilajezisemuzob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+see+saved+wifi+password+on+phonePDF 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_off0000ed4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4B 17792 bytes
SHA-256: 470fc86cd6cd8386823ec12047e382f750c56c7899f6dd5efd0b340e28b1a891
font_01_sfnt_off00011bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBB 10692 bytes
SHA-256: cee86670640594b2392281ba708f923aaa1a092c449e8d7d2dc55ed87b186934
font_02_sfnt_off0001343a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1