Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae6d6fa000c6916f…

MALICIOUS

PDF

80.5 KB Created: 2021-09-09 17:01:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4847881be0cc2675d6ff111a6b1f9cf2 SHA-1: 1552feae0f727beff06ccc648445c83f3065cf8c SHA-256: ae6d6fa000c6916fbbfcc1edb771eb8ffcfbfce2f029f0537d33028935691bd5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS uploads, indicating a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://centrlita.ru/archive/image/file/99328093520.pdf In PDF document text
    • http://klenderbio.com/upload/files/jixefasiwuvememedejab.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/tuditaxokupo.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210905_014955.pdfIn PDF document text
    • http://www.ezmoving.com/file/46617392004.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/a09eaf5fd6fcad0694a16e5dbae0a462/82535919353.pdfIn PDF document text
    • http://perfect-aerosol.eu/userfiles/file/87126734862.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/tilaluvazufokefoxosuli.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/87673ea29de5f19adbf6fa7f6b1852ad/28053610544.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/47809779819.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/sujemetijivim.pdfIn PDF document text
    • https://mccartha-cobb.com/userfiles/files/55726232405.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/lusananunofes.pdfIn PDF document text
    • http://hidropro.hu/upload/67520131312.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/60419351800.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/wixiwajubunasifirosureziw.pdfIn PDF document text
    • http://vuoncotichdep.com/upload/files/kiwerebuzigonupunad.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/48213361013.pdfIn PDF document text
    • http://net-work.cz/data/file/nujezevakumepozutebifava.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/24369914511.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/36236223924.pdfIn PDF document text
    • http://mayinmaunhat.com/upload/files/rebonaririrur.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/0f8d8932cd8c5c1c9dffabd784d4efee/tiravemugibeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=angry+birds+star+wars+2+unlimited+moneyPDF 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_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 17096 bytes
SHA-256: 1dc33ea9b1fee749da6a92a5ef8dd590e5673bf57396cc0ce7339f530195542a
font_02_sfnt_off00011a5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5F 11132 bytes
SHA-256: 3ac0843b49757ad27e1212f5de0861757cb67a32e433c7977d22ff9b292e6152