Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e77ff0c328d22fb…

MALICIOUS

PDF

92.2 KB Created: 2021-07-02 07:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 45aa1e24e91022267270c024be33e2bb SHA-1: 59a01259fe15d2a51d43aae7d014896ba8b161e7 SHA-256: 5e77ff0c328d22fba3588e0a450b61de91456be941883486cc50477020ea1595
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

Heuristics 6

  • 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.
  • 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.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4eb2bd8b8---vojesizekupinu.pdf In PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cd25c6e6735---84516482930.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8aa715f7c5---mutefuxerigiralubufiz.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/gsff950gnce5gp0h4mhd13gch4/repazifavuxizurapebilek.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/11908991816.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/lukawemimuvu.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/29513462406.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/2ahvd7jnpn3u2ph131i6dveqep/ripebijoretafolegebalenub.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/badiravejevamumaxo.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be1bd74a49d---xelakolusevedixo.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/25058905490.pdfIn PDF document text
    • http://canvangdientu.com/images/file/62475026108.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/040238f4a20588b915db6768e3a30d93/dukunejepasitimokem.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/de30024251a9fcc5511281e2b115fd15/vutapaxova.pdfIn PDF document text
    • http://dentherapia.hu/files/file/38414180939.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e90f70ada---gexoputasupepewigekus.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/33ec3ebe5d997529c9de91f306d12e04/keredafuvufifimu.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb94bc76a3d---6486175253.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b102c38a53b---64898848243.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/b7a10c40d31237a0d60c6e3ab533c170/bapoxuzigizon.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/fajuderowajarilidekelufaz.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/a47gh2807gumlqu7g5vi24g4lt/62180606567.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b6ebb29092---76254702817.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9164cb9b1---jatajanixovuj.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/suzezuvujixedulum.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/vajileleteburixeva.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/49315441528.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/bepetol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=practice+of+statistics+in+the+life+sciences+4th+edition+pdf+freePDF 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_off000102e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E8 18112 bytes
SHA-256: 97b51d6b4ec5f2554e46b32bc56243f22cc267642000ec3a2ba183c13f66efb3
font_01_sfnt_off0001319c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1319C 10796 bytes
SHA-256: 7a58e00d1a7c21f2846e85229048a23f204e966e476b04f6a0726ad0fbbc72da
font_02_sfnt_off00014a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1