Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae54e8f38b13c1a5…

MALICIOUS

PDF

93.4 KB Created: 2021-06-28 20:49:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3581679c17efa64f321501c2724d4533 SHA-1: 19357e4d207f1fbec627b99ed96672cbb7086ab6 SHA-256: ae54e8f38b13c1a5776393f0bed87da52b52d69c317f816bf19ec52c3f18ab24
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution campaign. The file's structure and embedded URLs indicate it is designed to redirect users to external, potentially harmful, web content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://medvor.ru/uplcv?utm_term=another+word+for+systems PDF link annotation
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/38c9dba18448945eb38d0376e22ddac4/96717861737.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/f92fd0317aa7676ea7e4d4ea027e64e4/74622336526.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/garanudekuwozat.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-19/20210519021314292719.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/62f5v50fsoia2ap3pt0jpn55n0/7798805190.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///202165162455180.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/74279033695.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee3763607c---45137374807.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/47672249490.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/7ae2bff665a9e2406da8506b9090c58c/56212774908.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3529ac1f7---65171196405.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703fc71b096---588488911.pdfIn PDF document text
    • http://amandamaitland.com/images/file/91100491989.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/gopepakin.pdfIn PDF document text
    • http://llux.vn/uploads/files/4217058382.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/l6g3tt08amlc44qng9lfgjc751/27891450755.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/11401654879.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/59fdea3317f44488e1c3e9ee7630a434/39518846878.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/kesesitujitubavavo.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608d1d2a37e18---44926981132.pdfIn PDF document text
    • http://staropolski.net/Upload/file/zujimedirobagi.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed51367fa2---6802012816.pdfIn PDF document text
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/7809118699.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a0aa93b9510---xojokakupe.pdfIn PDF document text
    • http://citra.cl/userfiles/file/83788134827.pdfIn PDF document text
    • 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_off00010c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C0F 10500 bytes
SHA-256: 93e58312e44022fce12d009e6b6aa2535ef94b43a392e72f5d67ee61b9f74721
font_01_sfnt_off000123d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123D9 17064 bytes
SHA-256: 1d278c9674356120af0875d9c3abcf7eb1a352fde292f6b100b917b6b0479699
font_02_sfnt_off0001506a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1506A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1