Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f61863111ccc92…

MALICIOUS

PDF

91.2 KB Created: 2021-08-09 01:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 82bf236069dddd9b082a24629874fa3a SHA-1: 8f82ce919aaa7f7f35c6a93a849d03104390c939 SHA-256: 35f61863111ccc92f686b38a61f45ec9125728e7f407ad1792a57f73ce9e955b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'SE_SECURITY_BYPASS' indicates the document explicitly instructs the user to disable antivirus software, a strong indicator of malicious intent. ClamAV also detected the file as a phishing trojan. While no scripts were directly extracted, the overall structure and heuristics point towards a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://laborke.ru/uplcv?utm_term=do+i+have+to+install+easy+anti+cheat+for+fortnite PDF link annotation
    • https://agrilaui.com/userfiles/file/dibuzojetel.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/og8mompe1bimu899gaf5vd3la1/gezepavazimenogete.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/38364825960.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/13684033437.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/xaretotumu.pdfIn PDF document text
    • https://ottopianos.nl/files/60512472068.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb1bee50ed---90330324246.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160fade7c06bf1---26104137452.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607236647cf4a---13532846321.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ee23eae410d---67938487070.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7lpomcsjsh76fmjr2cfb400e66/zagaramipivazifasire.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/kukofuruf.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/80968816845.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/bumipav.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/98795945462.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/d397409d6eaf48f8e5cf64d7b4e64c25/vetozeroxariwibulinef.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/07d4eb84d114101ceab3c2edaa43bced/55026153053.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160bfad30b7277---riziwekezufoxogiwukabitu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/r4etna67l588loqsiesmej5gd4/78921763631.pdfIn PDF document text
    • http://webinside.pl/userfiles/file/fazugoj.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/94065345536.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/4fd31c297824e0057d3d9d068d210e37/latejilawoxuw.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/34094698240.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/jabexesiwujeto.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/fuped.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16073f7753f963---fizaguwis.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_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 10612 bytes
SHA-256: 3194d40e5588a0bb3b051fbe2f06993610bd06756d7c0997c263a043f4138dcd
font_02_sfnt_off00013269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13269 16760 bytes
SHA-256: 27ef67a9bf51d1b2e8f787faac709d6ff63cbd53be0a98b14174c162edc633cc