Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad39366601b2a78…

MALICIOUS

PDF

100.2 KB Created: 2021-08-21 09:01:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8fc84f9db90a07d38bb318170d542911 SHA-1: 402c6d16bf770e629db5c7245f7e20678424462d SHA-256: 4ad39366601b2a78d09cacc9035580c52075ec8684f9955126bfd06d9518570d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself, combined with the ClamAV detection name 'Pdf.Phishing.Trojan', strongly indicates a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://kisikana.hr/userfiles/file/71923059174.pdf In PDF document text
    • http://zechnerbau.at/images/content/files/pigikevodulep.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/davelizemosanuzifudarozon.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/92837426224.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/zipineliro.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/1fbf4ee19a5f9dc3710cad07c5eb506e/lumidurituzufonepumeza.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/ragag.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210727222654.pdfIn PDF document text
    • http://muzycznescyzoryki.pl/userfiles/file/zimasoperas.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/b00bb7ea92bc3d3670d90984c38104ef/rugiwabovajepumulazuv.pdfIn PDF document text
    • http://chatsworth72.com/clients/5/53/532ec3c8dc0e95779814939736d4df6d/File/litamasapafuba.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/52462486307.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/widodovivasewetuzum.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/p8ef0s8udlr3i12b8b1uqfbd53/xikanipekini.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/d4c324c91dea15e036091fdecfa40c03/16630211007.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/33041573174.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/e9f0vstnubvgg99uquefbp14nk/zagilaro.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/88787165257.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r7128nrcfgvfikn51se13vb2p6/3752842826.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e8d8ace01b76efa1cb1f596cfe89192b/sewitasup.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0a528174f---61946609759.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/bimewujakadobibegolu.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/6274789535.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e14173084bee0acca209b4bdbb2684a4/nonokutixad.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d50c67a282---lojamuragejujutozarota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=the+secret+language+of+relationships+pdf+free+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_off0001084b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084B 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_01_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D3 18192 bytes
SHA-256: e1c66fe98a3b5996039cf32dcad78a00de71e66cd65baa0e0fc9d55e7d52ad9a
font_03_sfnt_off00016604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16604 11048 bytes
SHA-256: 709534ffb1c1a43896c94e671529f6f4a48e4df794a2b457b917c95d667e2361

Open this report in the interactive analyzer, or submit your own file for analysis.