Malicious PDF — malware analysis report

Static analysis result for SHA-256 f63e00673e098acc…

MALICIOUS

PDF

74.5 KB Created: 2021-09-02 01:32:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13f42a3c923142e67d32e4d9863237ac SHA-1: c5d531ee7b2dcc962ea16ae01f3f73b89ac184e7 SHA-256: f63e00673e098acc3709fba7544aecf2b4c22d33d8984f7bbc60f784d8e2284e
156 Risk Score

Malware Insights

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

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites, including WordPress upload storage. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://aadhaarretail.com/administrator/imagetemp/file/migesadolifivuwibanopok.pdf In PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd91b938ea---nugura.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c5af1d023247dd8818ede62faeff2460/pizemanafeguramonasa.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021073015024480.pdfIn PDF document text
    • http://inglewood1968.com/clients/68690/File/guruzifavekikimagegas.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/rebudowugatelujiji.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ebf2abd3d---31980801707.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202108280649081155.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/6a6ce135d41d9ebdf94f3980d792b637/37603690759.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/xifobimupesabikija.pdfIn PDF document text
    • https://sibois.eu/userfiles/file/tubadujiwefikegedosop.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608ade165d9fc---fokumutemega.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/56783085237.pdfIn PDF document text
    • http://moon-villa123.com/CKEdit/upload/files/zalitolefasipote.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/jurunuxekakunoxedijalotel.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/7341d508771797b506732a0568ad3cea/70534902160.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/sinuganezaxazisimixelerer.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/dowotovira.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/rbubuaa1t6k8iettpam1b989md/26510871488.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/jukenira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=reading+fc+resultsPDF 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_off0000c05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05C 16972 bytes
SHA-256: 6e0d52c4dcd33e2f4cb5a99ec4b9c7d3562956170a6a807775abd4cd66694939
font_01_sfnt_off0000ebfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 10676 bytes
SHA-256: 0ec77ec1b2d465f566a4cc31ea4fc6b71310dc937f1dd84efeaeed0d5efc1cbc