Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa8d0d91428fe0a0…

MALICIOUS

PDF

88.3 KB Created: 2021-06-27 22:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9cb6602a8238d0de82bcffa7102d808b SHA-1: 6ade8241703dad0d5a7e62c16fdbe83107419b61 SHA-256: aa8d0d91428fe0a0c24fc74e81058f9baa1a30c440b67a7e418a8e07fe3caaf6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the heuristic findings strongly indicate a malicious intent to redirect users to external, untrusted resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://synerhu.ru/uplcv?utm_term=positive+adjectives+that+start+with+c+to+describe+a+person PDF link annotation
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160be69474a992---37353593710.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a6f3b6182f0e6b3a29cfed180080fa58/59402307059.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0bb205d3c---39832702291.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/xibunifelozadovililux.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/51d5f3e9788639b8c29f46f84c9bb253/38451932262.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/16082252267111---rugidivefufepikumuworoji.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbd1b92d16---ruvelizujemibawifunuduwo.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/75540039492.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091f9fa8a8c6---59924832468.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a052010c37e---52972492897.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6962d495fa---xinixofolizofutubutobu.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/duxatebinudab.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d207d2e9f50---84397362256.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/4846218355.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/39640706141.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/dijalezogukemaze.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/susudurewexidova.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/t6c1eposreo9aji3jskn68uh1l/54491851171.pdfIn PDF document text
    • http://scro.ru/pic/file/wokideb.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/7d36924d19d4623f30f64ea748d200f9/dinuxaxudaduvuf.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c80e4b2c---75297501681.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/15483868274.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/i2m9mcrhhcvv4to2o7nghkjr9k/nudazebimeritekezovaj.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/fm18cmu19op06a5vc33rpusge3/telobapogolibakik.pdfIn PDF document text
    • http://abwva.com/uploads/files/sakanofuzed.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_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 16468 bytes
SHA-256: d5294f89d25ac083df04bcf23a3418998b6bcddaa47b587b2a64f2fc48b63034
font_02_sfnt_off00013a34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A34 10988 bytes
SHA-256: 4a92fac9534e1fa2170a92985eacad8794bfa42fdc359e052f8fe021111cb37a

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