Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6866168c547c60e…

MALICIOUS

PDF

84.2 KB Created: 2021-07-20 02:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 949be6aa3a0de3ca218e9656e71cd55b SHA-1: 0203c06b11d030b68bc78a07b65034e03cbab1cc SHA-256: d6866168c547c60ec97f511a50620eb565d700847a60cc28aeb80374f03abba7
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the presence of these links indicates an attempt to redirect the user to malicious content.

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 https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/820e5a6a688bb8cae9b9237857436b7c/57820147766.pdf In PDF document text
    • https://mertlakustika.cz/images/pages/file/julunup.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/tudalipevalarukaf.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/82598664288.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160731e6c04371---64307049261.pdfIn PDF document text
    • http://chayka-svg.ru/files/11394069024.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/984e6a4e0e9852426afcb326ec282b18/56680854752.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160863a987906e---20233131351.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/20425248253.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/17252321982.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/24432999791.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/pisupefetarefilovuri.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/114b94b24927e50128b98261628135f1/vowifatobezuxuxebezo.pdfIn PDF document text
    • https://aashianarealty.com/file/xefupan.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f243f24caa1---kesigu.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cce19369b8---26801216762.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/bf1d8cb1a77ce95dab07c5f2b2b40d9b/15416499569.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/77016278821.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/pirinazapo.pdfIn PDF document text
    • http://unsersohn.ch/images/file/vunug.pdfIn PDF document text
    • http://secretinvitation.net/images/files/wonuguri.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d94f466c42b---guregepakodagotimo.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde8d1e1fa2---motusanamitixapetiwanu.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/muzig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=mx+android+tv+box+user+manualPDF 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_off0000e62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62C 10812 bytes
SHA-256: f6e95101e9b11536c8473a458e1c39ea2fbf27fdf7b131e8fc4fc80d14e7c562
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11730 17100 bytes
SHA-256: 4fc347ff742afd83fa0e54b32925e0c9e77b1b7b4dea0433afd934329d90e0b4