Malicious PDF — malware analysis report

Static analysis result for SHA-256 f136ff2ae71b46d4…

MALICIOUS

PDF

82.4 KB Created: 2021-09-08 21:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c0e86a5dc13ca3a44f33a21c31036730 SHA-1: a2fdc7cd1ed6278d2803fada7b70549242be84f9 SHA-256: f136ff2ae71b46d4e2e4bf2517a65872582da5f9833f65328c3d6c3f4076c294
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous links to potentially malicious sites strongly suggests 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 https://musikkursus.dk/userfiles/file/28843904974.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/iqh4dtdv3msjsps6spt021p8th/bunaxorilidegasaj.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f86bf6f465---39503776616.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/f9b51cb115a19765965035c6356e61dc/97541367110.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/65254302466.pdfIn PDF document text
    • http://klenderbio.com/upload/files/bukuzam.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f8b0ee10b---31197259035.pdfIn PDF document text
    • http://ipceurope.com/assets/file/fizereganirun.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613113d1a2b7c---79133144895.pdfIn PDF document text
    • http://royalrep.com/userfiles/files/ligelajoxakivarew.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///55100961686.pdfIn PDF document text
    • http://travelcenterpuntos.com/campannas/file/zowakujabi.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/39233124928.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/19206630101.pdfIn PDF document text
    • http://ejmk.com/ej/upload/files/tuxefuto.pdfIn PDF document text
    • https://ever.dacola.com/upload/files/zibesuxasisesubanike.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/fotibususugimujigiwu.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/tifupetagetazakikal.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/joropuxitusolixijelawanin.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/gigeza.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/menodowowapujuvuxazuvoka.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/faxed.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/333t27mmqb38e2001agk8ahnu8/5192570209.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=que+es+paranoia+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_off0000db63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 18832 bytes
SHA-256: 6d97b11a74f60ba1b9eca3952f8cc4720e8c36cc957c3003a4090e145f335f7c
font_02_sfnt_off00012323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12323 10508 bytes
SHA-256: 9eaf875e5732dedb4683732e30afd57c75b46fc68896ea68acec8c4a6105f131

Open this report in the interactive analyzer, or submit your own file for analysis.