Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acd272ad4bff527…

MALICIOUS

PDF

68.6 KB Created: 2021-09-25 20:38:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: dd89f74355d65900a165d00537910682 SHA-1: 183f5c6a7a5349f133a52b956271944fc6656669 SHA-256: 8acd272ad4bff5278646813958fdd09c0dcb1722cf8271a273a38f7e9058be80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of embedded URLs and the overall structure suggest an attempt to distribute phishing content or download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://synerhu.ru/uplcv?utm_term=ben+10+up+to+speed+mod+apk+unlimited+money PDF link annotation
    • http://dichvuhieuchuan.com/upload/files/6579634011.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/e62f29faf33b1cd6f2afb3da872af981/lavepugekunaboridesi.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89479e20f---54563864146.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/falisolujelesinekefikuban.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/fenediridobazuj.pdfIn PDF document text
    • http://palaciodelosnavas.com/userfiles/file/mevotalubudib.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/75e2128a47170ad1531fec409ab2e9e6/19935453003.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/qn2iap62v9qkip07gr588rkba2/xiwisakisifedusasowewoduk.pdfIn PDF document text
    • http://cpk.by/ckfinder/userfiles/files/36730377980.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/zatolubaxupoxukuxugadu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/5033be2fee2e61ca9b829f146f49c8ec/negefu.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/68323694542.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/66192294769.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/jusawuketawanuxanig.pdfIn PDF document text
    • http://sial.pl/galeria/file/wazidovavajozidozavugef.pdfIn PDF document text
    • http://pronobile.com/catalog/file/78855831893.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///witegigala.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161397aee0d989---gowatuwaliropadevazet.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f21d578e8f---42816508168.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/kijudupebise.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_off0000ab00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAB00 15148 bytes
SHA-256: 6de289ccd048746e0972d7b2aff2f982dbfabfaa0e9eb6c0954b6d7437ea6b99
font_01_sfnt_off0000d18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD18E 10984 bytes
SHA-256: 8097136260528dfe86cec68fb48fbb8c5151c82629bfd1e7af188ed93d33953e
font_02_sfnt_off0000eb1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1