Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0241ac4b8d1013…

MALICIOUS

PDF

113.6 KB Created: 2021-09-02 10:17:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 895dda1591e30327f1d03bad511966a3 SHA-1: 48b28d5bed10666927f5f65ed9b63d3b4eb20aa0 SHA-256: ef0241ac4b8d1013d1e7027aaf85f5228cac482407c4589338982c45e12e652d
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bloomeng.com/uploads/nerubodijumosanek.pdf In PDF document text
    • http://salamatekhanevadeh.ir/ckeditor/files/files/74234092337.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/vogupofo.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/xakutogusalakis.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/12992443167.pdfIn PDF document text
    • http://chinoboxingclub.com/clients/36032/File/senosozovifosele.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/jepiposimibibotusesoraso.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/b9d6a693badf8654107985f4dbd443c3/fotiwolemewuxegusog.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160986549c110f---lofapozamofojegateji.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/satukebi.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/makibelipaxenil.pdfIn PDF document text
    • http://vangphugia.com/userfiles/file/maxad.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/sepuvulomamipez.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/72528518175.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/815737715726e5e45b186a5762e6d6a4/sikerasozuwas.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/d6ccu86s02g6fit94i7r2626e6/26319095853.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/12805578071.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5dme2l9r09smt9gl0bs818t0f6/jikadawezixu.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076832590da9---wufabazijudixo.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/57801f10dfde4c6c59313390518d08cf/wujotifamewesunisixudire.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/fijakuvopojevi.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/xitesobesuguwelaxejukubo.pdfIn PDF document text
    • https://icrs-as.com/userfiles/file/pazefavabavasivipepukuzum.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f16f5068dd---81762166310.pdfIn PDF document text
    • https://polistirendecor.ro/app/webroot/files/userfiles/files/95487318335.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/ruburutorasoboj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=miniature+guide+to+critical+thinking+pdfPDF 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_off000153a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A4 10916 bytes
SHA-256: 351a74fee3f907b605c945f6a78f0c5cd999fe0ff71aff48deeb8fd72dfc9cca
font_01_sfnt_off00016ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16CA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000184b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184B7 19836 bytes
SHA-256: 7ae4a8d7dd461d88d4b863df7de5b45c697a0ec759165f6d935ab289cb0f9b0f