Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d16fb6c6622496…

MALICIOUS

PDF

83.2 KB Created: 2021-09-23 00:52:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 657215ef11be51e3915c835777946ae7 SHA-1: 2ad5c75aa4f3d92fdba12ad38e149a5b17734046 SHA-256: d7d16fb6c6622496b6d7f57531ea5250ca6dc6dc74f42829e3399bed4df23d3d
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as malicious, including a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs suggest an attempt to redirect the user to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://keyflounge.nl/userfiles/file/mofabiforor.pdf In PDF document text
    • https://stancijanegrin.com/UserFiles/files/zidadovav.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/18154386539.pdfIn PDF document text
    • http://mixline.ru/img/lib/file/rorage.pdfIn PDF document text
    • https://lbjgold.in/ckfinder/userfiles/files/31282718796.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/68bc470004f37d6a8501de0a249f0ab0/85340711485.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/kuvaxekukudokoferuzi.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/64104348338.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/72114376909.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/ginufixatoso.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/jozonabiwo.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02e0c2fff---76028802617.pdfIn PDF document text
    • http://wixoon.hu/upload/file/wojofitevinapaxuxev.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pewomokal.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/bedaweli.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/2c343f3ca164919e1d11f04498e805f2/948660741.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021910_9229_766.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/taretujekufedatujede.pdfIn PDF document text
    • https://mbzgogo.xyz/web/img/podborky/files/37762642464.pdfIn PDF document text
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea05f58f6f---zifoxodidasudu.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/72240737995.pdfIn PDF document text
    • http://olguanaokulu.com/upload/file/11938243303.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/94749478729.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/32105279263.pdfIn PDF document text
    • https://becomethesolution.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+install+android+vdi+on+virtualboxPDF 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_off0000dd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 10592 bytes
SHA-256: 6f1ff0a58443adc6f0bddd5296b1d2f35dd289525538c294e528bfc7b21ed648
font_01_sfnt_off0000f5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D7 19100 bytes
SHA-256: 3710b03a69d19c50e533ef7bba41dfb16d919e3ef4239c3044ea7970c4b51a4e
font_02_sfnt_off0001273e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1273E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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