Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfe1dd30e2cce40…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 02:30:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 89de8ef7741af136b569017d72d2546c SHA-1: 334e9b31a8faecf7ffe99d8a79af67bf1a6f17dc SHA-256: dcfe1dd30e2cce40f4f17278ba2e48efdf6b47f77d75460840c3ae0f6059bb35
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. One URL, 'https://queure.ru/uplcv?utm_term=plant+vs+zombie+hero+mod+apk', suggests a lure related to game modifications, potentially leading users to phishing sites or malware downloads. The presence of embedded JavaScript, though not explicitly detailed, is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=plant+vs+zombie+hero+mod+apk PDF link annotation
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431db1c9d96---supedofigukimij.pdfIn PDF document text
    • https://inprovitcaribe.com/ckfinder/userfiles/files/rotifokizajepuw.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/b8e870952348d006f4b7161176cfc05b/wibixejalexozuxawige.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/6061434330.pdfIn PDF document text
    • http://mcserpenti.com/userfiles/file/98952187679.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613454a1b811a---70266397258.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140f55c6d640---20836661734.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350a975a1bb---11042336926.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/nalelikivom.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/bivojotakiluxo.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/migetumipiviwasaratedi.pdfIn PDF document text
    • http://congtyvima.com/images/Download/kexeluwuxokovi.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/setududumegozotov.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/jojetefixiral.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/pisaxosulubomanilidepem.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/mobemapusoxekefogo.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/82679379482.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161365a1aeacbb---mefunepadovuli.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///48546499910.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/9818106333.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/78677109625.pdfIn PDF document text
    • http://lactopad.com/uploads/files/towopuritul.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/14224053582.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614300b08d18f---886628382.pdfIn PDF document text
    • https://majubesar.net/contents/files/wikigumoxogira.pdfIn PDF document text
    • http://boldogelet.hu/media/49171333096.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_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 11016 bytes
SHA-256: f9f681cfd78935c9db80d9935977e4e0161ac4a1cd8ccf4db95af647d863d8ac
font_01_sfnt_off0000fd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD69 17296 bytes
SHA-256: 40d9b755b3d85aefae20c5677bf7e3aa490d5460b155e52b77561fb52e9b225e
font_02_sfnt_off000129ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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