Malicious PDF — malware analysis report

Static analysis result for SHA-256 276719991f411fbf…

MALICIOUS

PDF

100.6 KB Created: 2021-08-25 20:16:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2334fc4002f012f2a81ea565803d8a08 SHA-1: 8fea5d8593e299fab4e9d73cb792ad9b466222e9 SHA-256: 276719991f411fbfec0f3c41acccbf43c371f6027fd27b99c69c2514b60d1166
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or malware distribution lure. The document body is heavily obfuscated, preventing a clear understanding of its specific pretext, but the presence of numerous external links strongly suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/lonowikibuju.pdf In PDF document text
    • https://discovery99.com/userfiles/file/85134449443.pdfIn PDF document text
    • http://erex.hu/upload/file/vuzamobupiresaga.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/45417098329.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/b1d278de48874e24d4f79d133204eeea/velolinikiriko.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bf91afe916f---1554593794.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f209043a0---42892384201.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/43375786671.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796cd2b9d79---resiparixuzajikef.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/62404950360.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/22186061387.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/bda892c98dd2b12827d740542a3e98ac/gijevukosa.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/8027768780.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/bc3bdd8be057cb165985c1e2dcc18d7b/mazegamapepanavif.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/33690250404.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/74248624012.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/xodalazidubakova.pdfIn PDF document text
    • http://toroisg.com/public/images/files/80379262863.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/segeziwalixezurekowagaf.pdfIn PDF document text
    • http://urbancollab.com/userfiles/Proj_Name//files/61009713028.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d22030b2b0ee3a557b983e270a5d4ffe/karobuxijobowozu.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/40475659646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=highs+and+lows+tvb+watch+onlinePDF 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_off0000e87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87D 10832 bytes
SHA-256: a0b79a2fc28245d03e06e987d4e546f9b6d0c27954679a4a701849fa18310407
font_01_sfnt_off0001013d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001194f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194F 17752 bytes
SHA-256: 33127f082fb483522fd49ba6bc8bde227e3635efa8664b687eba99c22d98b614
font_03_sfnt_off000146f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146F5 20952 bytes
SHA-256: 4a9eb3ac7f52f7e009521cad91ed8b315cadf8da77f93b2d6e12e2746eba12b7

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