Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc7a182b4094ac1…

MALICIOUS

PDF

97.9 KB Created: 2021-07-30 20:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32c34342c3935c2cb53f12d89ede0829 SHA-1: c0b4b2c6088348a6b304e5eee86ebbd8be2c0697 SHA-256: 4dc7a182b4094ac1bbc1d68b23445e89e57795598d2491d2bc5c0c0a57cf73f3
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to various compromised WordPress sites and IP addresses, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/aa9d55c36bf10b3d50f7aa7ccb2fb9b1/26631796181.pdf In PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096ddc43d6ab---wumoso.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/xagujusogafene.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/42122851969.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a35bb5d9a0c---dosavuvozip.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/69nccisellccs29raq9qeb62k0/31890552452.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/xovuda.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/kinebovozap.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/56789443289.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/902f91743926f3d2abb8c41eb08d1d00/46257648468.pdfIn PDF document text
    • http://naucseto.cz/storage/31164965391.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/buxodikakitatexetaf.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2a238d2ef---milukezunusuvipixufevorob.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ba5a9b1da5050326143d746b2a0882f2/10582949824.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210726_050314.pdfPDF link annotation
    • https://www.passion-rnd.com/upfile/files/2021/06/17/munedekubesamalurogu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608ab288b07e9---68050113688.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97248ceee9---wovepigum.pdfIn PDF document text
    • https://people11people.com/uploads/File/77350628825.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160706462a110f---zatenubid.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1phv2b34cfpsrai2ui78ld158a/64179796468.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/luzomefaso.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/43ba077bb008db4ace1b7e58abe9faf4/mijumu.pdfIn PDF document text
    • https://12shio2.com/contents//files/85848780966.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/xavigukunudezavekuro.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/96524974592.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=%C3%BCcretsiz+araba+oyun+indirPDF 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_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012e55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E55 10832 bytes
SHA-256: 53b992e146a8f0dd612087e02ca234890b049ba265bb347fced399b6a976df5d
font_02_sfnt_off00014768.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14768 19244 bytes
SHA-256: 5eb0fd5ee721c3c64b52a6f885793c5954401884ce05423e9b794bf59c1bfb30