Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a29958f21e6e4f3…

MALICIOUS

PDF

80.4 KB Created: 2021-09-20 12:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4b2f8eddc561c7be9098a37b5004f18 SHA-1: 80e8d66b2ad630131aebb891492bb92ab9485c59 SHA-256: 1a29958f21e6e4f3a556027b060b3d88d1d678de95f19585c04dbe36386766c1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://cructi.ru/uplcv?utm_term=wonder+egg+watch+online PDF link annotation
    • http://zavalinka.by/var/upload/file/damixewuw.pdfIn PDF document text
    • http://king-pro.com/userfiles/files/96225247313.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613382ab74917---juxadegalepuloridedegabe.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16144e42d49028---mafedorozorimokulazu.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/goxogilegajasipule.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/3101283447.pdfIn PDF document text
    • https://norservis.info/files/files/33128090522.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/93217107076.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/fizakajebifulavewo.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/rikexavawesefezebapup.pdfIn PDF document text
    • http://refpecsbelvaros.hu/kepek/files/27984363316.pdfIn PDF document text
    • http://belst.by/upload/file/nazaxajukav.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b142e9537---16540558690.pdfIn PDF document text
    • https://artinterior.bg/userfiles/file/97828726805.pdfIn PDF document text
    • http://simsoncantho.com/userfiles/file/62656778087.pdfIn PDF document text
    • http://dongphat.net/upload/files/relaxerivenisuvejofaxilux.pdfIn PDF document text
    • https://deesudcoolingtower.com/userfiles/file/79327733537.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/92678111937.pdfIn PDF document text
    • http://kim-clark.ru/files/file/topugarapopekokagejuwadex.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/jupakevutumedelafa.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/11130864523.pdfIn PDF document text
    • https://hotelharmika.com/assets/userfiles/files/supoxumijemakosemekeli.pdfIn PDF document text
    • http://phuclocvienjsc.com/uploads/image/files/nawetokome.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021090812583860.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_off0000d649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD649 17844 bytes
SHA-256: f4f3b78b8e3a040e095476f5dcd05e2cdcdad4b3c427fc8e4c60a7f2711ea75e
font_01_sfnt_off00010471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10471 10560 bytes
SHA-256: b675b34aa117d14d11ad76c8849ca022fa569d37414c99ac9403f87dcb0c9787
font_02_sfnt_off00011c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1