Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a2e97c380a7495…

MALICIOUS

PDF

89.4 KB Created: 2021-08-26 04:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b37d1138d973e0b2b87819adbb152963 SHA-1: a4dcfd5227c9d2552d4c59ff56465981ca2e1ce7 SHA-256: c1a2e97c380a7495bc6fd91ef91de2ff5217187ac0b0d17f230454fe653f83d9
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous external links, many pointing to disposable hosting and compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the presence of external links and the nature of the hosting suggest a mechanism for delivering malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://charmingcurls.se/upload/file/negebenofakaluzo.pdf In PDF document text
    • https://mk-sito.it/uploads/file/tatilame.pdfIn PDF document text
    • http://asustainable.com/global/file/puninomekitewafago.pdfIn macro / runtime command snippet
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/68e661d68430e7013c302cc51033f921/vujosawexowema.pdfIn PDF document text
    • http://www.videobezopasnost.ru/ckfinder/userfiles/files/remapew.pdfIn PDF document text
    • http://rhondachem.com/d/files/98117421561.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/nozabipufosenemip.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb02841e49---wetedut.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/3f4b68e86d95d0e618e27f8a807f3654/64765155222.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/xasajekome.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160961f9fdaf88---silopunuke.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/2326051020.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/fepoviko.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/u8d0th3vqsr4hc4986b3r58u6u/xavatutupesepijuviroto.pdfIn PDF document text
    • http://zhuoer.ltd/userfiles/file/woxanapugezinaba.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/4121623712.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5143acc930---17809484062.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/8ba91df6c6bc06f8b4a4052a74525a47/matumopovisawivi.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610aed788970b---13554186266.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f36d48e938---82087777960.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1610dc632f2fe8---53710770114.pdfIn PDF document text
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789e7447cd1---44052953764.pdfIn PDF document text
    • http://fini.hu/userfiles/file/5243674537.pdfIn PDF document text
    • http://nbkhjc.com/uploads/202108/file/2108041936091621591f6jl9bb46g3.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01181042b7---nitererivonukujalakajurif.pdfIn PDF document text
    • https://mk-sito.itIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=procreate+pocket+apk+android+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE177 17676 bytes
SHA-256: 88285639b8f1ea286e6700d4ff74cab9a8247463ae424b347138db52e3bd30a4
font_01_sfnt_off00011061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12872 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off00013de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE9 10520 bytes
SHA-256: 8e4d837e091bef8b55a0277b8977c1417147b483e9fa1f09564d1e6fe0b2b1eb

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