Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd503d6879996eb7…

MALICIOUS

PDF

116.7 KB Created: 2021-07-08 05:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c3d5d30cfe74fa91659ff72d79239d1f SHA-1: 9497616e2d12918c4343164df408e0d626ac30e4 SHA-256: dd503d6879996eb7e3bac95a6146ff39ebc7a508491490a81039faaa155e23c2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites, indicating it's designed to lure users to malicious content. Heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this is a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://inwebjor.ru/uplcv?utm_term=general+purpose+government+examples PDF link annotation
    • http://mooneyes.pl/userfiles/file/zofutoz.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/25429441090.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160851382acaf7---78605315275.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/ruxikuxilemepefik.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/af74968d1557d9102e85a4c176664f0d/vodimegotulez.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/23510343876.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f1d80f6a7---vavubozed.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ef1b391d2---kawanoxinasubedubujilazar.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad031762306---42761263023.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160872098495c6---98463186496.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/bc4aobkikj2fchfb2qo10rl473/fogumipenulonewegif.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/telasefuwururifoze.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/13722644708.pdfIn PDF document text
    • https://espaciocultivarte.com/ckfinder/userfiles/files/81394457545.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/a3f71814cf0ac1fa828a65c6bc886662/vekit.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608103b1ea647---sizidexexefata.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084e7170d18d---panezub.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef7e0c49e8---babepudobatopomusarawega.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/30mp4eoa8sk8vt2ik72ike6512/vewukonoluzoziloxoxakot.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/aa27f08ee94e4efea14e692a9af8a36c/76533639136.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16092da90c7ac6---kezoxitage.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9e1b68f90---subawul.pdfIn PDF document text
    • https://valdisieveshopping.it/file/71030707855.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607579d8ed401---wudokufugab.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_off00016655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16655 10808 bytes
SHA-256: c525e47486d3e11ebf88f0e47e2f5f47a43bf45ce6d6ea8ae72843f4ba93b754
font_01_sfnt_off00017f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F54 17672 bytes
SHA-256: 71f0cd38704471275c7a2a49e7a1b36439a88f1ccd4720092d3f1ff13e9d3777
font_02_sfnt_off0001ad4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1