Malicious PDF — malware analysis report

Static analysis result for SHA-256 d96bdbd893fa62a6…

MALICIOUS

PDF

82.9 KB Created: 2021-09-19 15:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 51b2f8d6e18f379a81bc97b909f2ba9c SHA-1: 0dc5b77f364c56b76e40693677dce62f9b60e290 SHA-256: d96bdbd893fa62a6e1a8e86448174eaffb8f7b3b845518bbd271dc6c434f437c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a ML classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised websites, likely serving as a link farm for phishing or malware distribution. The presence of external URI heuristics and link farm indicators suggests the primary attack pattern is to redirect users to malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 https://allytemp.ru/uplcv?utm_term=we+sing+downloader+apk PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161369092e2d5b---xazixuzimudezupama.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/161471b1ef16ab---banukosuwuvevewatizo.pdfIn PDF document text
    • https://digireg.es/upload/jozaweneselawa.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/tikupokex.pdfIn PDF document text
    • http://sksound.com/userfiles/file/zuresidovemepuz.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/zunusewakimafovebiwenupo.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/54385348644.pdfIn PDF document text
    • http://benly-carson.com/product/files/xizabedoxig.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/woxakutupot.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/zaboni.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/zadedibakaw.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/75099837362.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/99668721088.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/zujatasotesebemipak.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/66608456814.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/voxanajagedasogoj.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/36603932534.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/64555329443.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/f18689a98f25dbbc56b665224a9ff4b6/bovumude.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/rejunotinomabutikafera.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_off0000dc5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 19340 bytes
SHA-256: dd0e59cbb31f8165444c00d2e24e5b73e2735c5ed3096541eda32eb08ee0b722
font_02_sfnt_off0001267b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1267B 10640 bytes
SHA-256: 862f55786f4949e02aecf5a2ea6828d10170f44fa3efc497f1b5bf8fc718b36f