Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36da923e52bb03f…

MALICIOUS

PDF

72.5 KB Created: 2021-09-23 23:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b3efc7974557d9d7121f1186769a0b3 SHA-1: c7b18de2fba9fc90ea89b96fb2c3b66e10a37b1c SHA-256: d36da923e52bb03f5f7572fe383b648ce214ccacd973a98bfcfef18dd2db3db2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains embedded JavaScript, which is often used to initiate malicious actions. The heuristic firings indicate that the PDF acts as a link farm, directing users to various compromised or disposable domains. These links likely serve as a lure to download further malicious payloads, as suggested by the ClamAV detection of 'Pdf.Phishing.Trojan'. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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.
  • 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://synerhu.ru/uplcv?utm_term=psp+games+ben+10+download PDF link annotation
    • https://ntpuvoice.com/ckfinder/userfiles/files/mowon.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/lixebimimawife.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a3c5b3f3edaf28179c7c3dc586de1c61/gozunix.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/jisekazesexebozo.pdfIn PDF document text
    • http://xn--2o2b17g32e8xisqq.com/userData/board/file/94877241399.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/55813969644.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/22288014756.pdfIn PDF document text
    • http://expertworker.paraleumarian.ro/app/webroot/files/userfiles/files/jesexezafuxugapozemegu.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/37348772962.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/46942626498.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/kolixudag.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/10461810245.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16147c1120a9ba---29651249450.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/motazuzemerabugudala.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2451028805aaddf27f97e98dcdc6ff1f/24837976197.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/41834756395.pdfIn PDF document text
    • http://runhouchem.com/upload/files/zawiv.pdfIn PDF document text
    • http://tvtamminhphat.com/uploads/userfiles/file/lopepizuvabofevapozoda.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/5975556994.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/redizakurulidumodadesis.pdfIn PDF document text
    • https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/wowojutapubu.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/vulixozibovikeg.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/vatilurulibojidel.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/95827764524.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/vemaje.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_off0000ba7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA7D 10844 bytes
SHA-256: ab86793fd1ed0e20baee32cb922f8c95a2d214d6a22fbcadb002322561b1e592
font_01_sfnt_off0000d325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD325 16164 bytes
SHA-256: 3b6977cae28f45ac507f77b8aadee7be8281e54325b9c8fbd366357f96621076
font_02_sfnt_off0000fc44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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