Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae2a27fb2a01aef1…

MALICIOUS

PDF

101.3 KB Created: 2021-07-03 08:47:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: afabfc67187210a9a378c681ddb896be SHA-1: b6382fb13569957ebc3472a5a21f5aefdfeb77dc SHA-256: ae2a27fb2a01aef1f9ff6b61dd68027ed222848f962fdc8d0f8253384f6bf208
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS platforms or disposable domains. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for human readability but rather for programmatic interaction with external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ad61a765321307acb44145715bc74058/84379614410.pdf In PDF document text
    • https://infrastone.com/userfiles/files/fezaf.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/xazebovirozewini.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda24b542b---solujadovu.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/95522395470.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2d8f37911dc370bf110d7a03ca9f640d/17286284716.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/8v5h94h637qu0fd94t7lfcufpt/zonojup.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/r70k0tp53q1jl97djnculom30n/vixanoxitusobexorub.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/e2vvcfj8nvlqm61ep97hc2gjb9/lowawulavi.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/laxesudukida.pdfIn PDF document text
    • https://rivaflo-south.in/userfiles/files/zobigidivakasopekiga.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071938e526b7---xenepinazagores.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a8b57c70489146adc331014d5450b1c9/22328179780.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/734612064.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/35376531589.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/2f4903b5a6dde404d8f2aa08ee51c6f3/pevuxojazirapi.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/vozas.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d24696ad013d43740bf63bae2a096ac6/vibaxizur.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/53213895069.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/pevovonugamuxubu.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/4068860546.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c44c627d148---vaxiv.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6226ef09b2---garugutadobiwuzibanip.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6c5423b17e5921329474517ad51c2969/vunevatedawetetulukamugo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=studentvue+tolleson+elementaryPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012558.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12558 10672 bytes
SHA-256: fd90a3594171291a7c50a718d60f7a00a791327c11234d62cfb60ed1ad8ed83d
font_01_sfnt_off00013de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000155f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F9 18704 bytes
SHA-256: ab45cf555427ab6db4a0c6854abe05af76d614af1db596948981da8ad17375f9

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