Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5ffd4b4806fd2df…

MALICIOUS

PDF

77.6 KB Created: 2021-07-06 22:53:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fc534943ea054e5f959c0532cd4b93a8 SHA-1: cdd464e8e6b7d778a45c20c9e6924b8a03482ce0 SHA-256: a5ffd4b4806fd2dfbb6062f1395e609744a3b731477bad9670f03f49489b9aba
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6f537c931---85087480500.pdf In PDF document text
    • http://brianhaymore.com/images/e/file/10362127978.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/vagekewudagivilab.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/177f5e022060c00baf71355e3165929f/xiroxavug.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///sefaxigofiwi.pdfIn PDF document text
    • https://hoalavender.net/upload/files/56353663216.pdfIn PDF document text
    • http://cayxaotamphan.net/userfiles/image/file/duwukadewotitoziv.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/mirovatuwanumiwenovepuf.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/lenowodukivazefupe.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/c61c372e33d5234495e9b1bad7c939dc/72644090378.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/67635037265.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/kaluluperokefemewugevex.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd513dbb4ca---71797999899.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075888c42485---xaxebilubiwisaxok.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ee605cd39---fefefege.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aced137ad8a---67466469383.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/mafunazitekano.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d640fbc7119---nerofedisuke.pdfIn PDF document text
    • https://kueapem.com/contents//files/89055361930.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/4qd3ithr5qbbh7f03g2gsrjb7g/winafakupin.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/2caf1ee65b1c34bdc04aac3fa0e361a2/49267651272.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=ncaa+14+xbox+360+rosters+2020PDF 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_off0000caa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 17152 bytes
SHA-256: a04df40d525c670870609a94d0b87a0e2bb8d7e20d3d0b8238c184438f7569f8
font_01_sfnt_off0000f76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF76D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F84 10912 bytes
SHA-256: 1334335435e57ee0c8815efd11acd08d21345ad5c69925831d3c59ba388a8d57

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