Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d57f23a5dbb431…

MALICIOUS

PDF

81.7 KB Created: 2021-09-16 11:56:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6258bef2332ebed7f80f52a0279854eb SHA-1: 2b72372265c767ab908400c9c8a7b3f30ec00763 SHA-256: c0d57f23a5dbb431e7dc6fee37e3d08d09956c9c81adf42e71a2acb88297704d
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many hosted on compromised CMS uploads or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a second-stage payload via the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nomylo.ru/uplcv?utm_term=frantz+fanon+a+dying+colonialism+pdf PDF link annotation
    • http://julianowka.pl/ckfinder/userfiles/files/dorejozetesemiguwatubive.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fuxiwonokez.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/420ea7b19bd083fe3a35f197683eced2/17571102950.pdfIn PDF document text
    • https://paradigma.bg/uf/file/tipumopiludune.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/45226217954.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/14209415714.pdfIn PDF document text
    • https://cochleartudaskozpont.hu/files/nizako.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1aba9016b---36372046561.pdfIn PDF document text
    • http://saint-party.com/media/file/voxof.pdfIn PDF document text
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/69186123504.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/54105690641.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fefipotedezum.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/wuliwuxaselu.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/vojok.pdfIn PDF document text
    • https://denimder.org/resimler/files/54868469607.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/ladoxifivujopo.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/65166402805.pdfIn PDF document text
    • https://ideylia.fr/uploads/file/13319883127.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/xegakoromuboxuduvo.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210902120552.pdfIn PDF document text
    • https://zaindu.drogomedia.com/files/galeria/files/daruwejobipexadewuzo.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/79401676605.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/kenuboruveleg.pdfIn PDF document text
    • http://lotusburbank.com/uploads/files/pesogosixerewadenafarew.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/17591541022.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/5dc29ecd117624f1d7811413da2183f3/46613940831.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_off0000d72f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72F 18724 bytes
SHA-256: 43ace3efc83fd2712d83db6dfc9c8538dde0d77dfb060e301de5725e1062cffd
font_01_sfnt_off000107d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE7 10980 bytes
SHA-256: eeff8d8cb4c5ca19ebc0389852b81ec3eca68ac19364a16991c186098c304bef

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